diff --git a/Makefile b/Makefile
index 73861e6..6622355 100644
--- a/Makefile
+++ b/Makefile
@@ -108,7 +108,7 @@ run: $(NAME)
 
 test: $(NAME)
 	@echo $(B_PURPLE)"\n---------------------------------------------\nlaunch tests\n"$(RESET)
-	-@bash tester.sh
+	-@bash tester.sh -d
 
 clean:
 	$(RM_OBJS)
diff --git a/src/lexer.c b/src/lexer.c
index 1ce4413..683cce0 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -100,7 +100,7 @@ static bool token_is_number_double(const char *input, int input_pos, int *token_
     return true;
 }
 
-// token is superscript int (e.g., ², ³, ⁴, ⁵, etc.)
+// token is superscript int (e.g., ¹, ², ³, ⁴, ⁵, etc.)
 static bool token_is_number_int_super(const char *input, int input_pos, int *token_size)
 {
     int digit_size = 0;
diff --git a/src/printer_solutions.c b/src/printer_solutions.c
index 4e8853a..2588923 100644
--- a/src/printer_solutions.c
+++ b/src/printer_solutions.c
@@ -141,36 +141,76 @@ static void print_solution_delta_positiv(s_solution_degree_2 solution)
 
 static void print_solution_delta_negativ(s_solution_degree_2 solution)
 {
+    double denominator;
+    double denominator_abs;
+    int denominator_sign;
+    double right_term_abs;
+    int right_term_sign;
+    bool has_first_term;
+
     ft_printf("Discriminant is strictly negative, the two complex solutions are:\n");
 
+    has_first_term = false;
+
     if (solution.all_int)
     {
+        denominator = solution.a * 2;
+        denominator_abs = ft_fabs(denominator);
+        denominator_sign = ft_fsign(denominator);
         // solution 1
         if (!is_nearly_equal_zero(solution.b))
-            printf("%g/%g + ", solution.b * -1, solution.a * 2);
-        printf("%gi/%g\n", solution.delta_sqrt, solution.a * 2);
+        {
+            has_first_term = true;
+            printf("%g/%g ", solution.b * -1 * denominator_sign, denominator_abs);
+        }
+        if (denominator_sign == -1)
+            printf("- ");
+        else if (has_first_term)
+            printf("+ "); // dont print '+' if it's first term
+        printf("%gi/%g\n", solution.delta_sqrt, denominator_abs);
 
         // solution 2
         if (!is_nearly_equal_zero(solution.b))
-            printf("%g/%g - ", solution.b * -1, solution.a * 2);
-        else
-            printf("-");
-        printf("%gi/%g\n", solution.delta_sqrt, solution.a * 2);
+        {
+            has_first_term = true;
+            printf("%g/%g ", solution.b * -1 * denominator_sign, denominator_abs);
+        }
+        if (denominator_sign == 1)
+            printf("- ");
+        else if (has_first_term)
+            printf("+ "); // dont print '+' if it's first term
+        printf("%gi/%g\n", solution.delta_sqrt, denominator_abs);
     }
     else
     {
+        right_term_abs = ft_fabs(solution.right_term);
+        right_term_sign = ft_fsign(solution.right_term);
+
         // solution 1
         if (!is_nearly_equal_zero(solution.left_term))
-            printf("%g + ", solution.left_term);
-        if (!is_nearly_equal_zero(solution.right_term))
-            printf("i * %g\n", solution.right_term);
+        {
+            has_first_term = true;
+            printf("%g ", solution.left_term);
+        }
+        if (right_term_sign == -1)
+            printf("- ");
+        else if (has_first_term)
+            printf("+ "); // dont print '+' if it's first term
+        if (!is_nearly_equal_zero(right_term_abs))
+            printf("%g*i\n", right_term_abs);
 
         // solution 2
         if (!is_nearly_equal_zero(solution.left_term))
-            printf("%g - ", solution.left_term);
-        else
-            printf("-");
-        printf("i * %g\n", solution.right_term);
+        {
+            has_first_term = true;
+            printf("%g ", solution.left_term);
+        }
+        if (right_term_sign == 1)
+            printf("- ");
+        else if (has_first_term)
+            printf("+ "); // dont print '+' if it's first term
+        if (!is_nearly_equal_zero(right_term_abs))
+            printf("%g*i\n", right_term_abs);
     }
 }
 
diff --git a/src/solver.c b/src/solver.c
index 37a3d03..764efb3 100644
--- a/src/solver.c
+++ b/src/solver.c
@@ -28,11 +28,11 @@ static void solve_degree_2(s_solution_degree_2 *solution, double a, double b, do
     solution->c = c;
 
     delta = b * b - 4 * a * c;
-    solution->delta = delta;                                                    // Δ == b² - 4ac
-    solution->delta_sign = ft_fsign(delta);                                     // DELTA_PLUS or DELTA_MINUS or DELTA_ZERO
-    solution->delta_absolute = ft_fabs(delta);                                  // |Δ|
-    solution->delta_sqrt = ft_sqrt(solution->delta_absolute, DOUBLE_PRECISION); // √|Δ|
-    delta_sqrt = solution->delta_sqrt;
+    solution->delta = delta;                                          // Δ == b² - 4ac
+    solution->delta_sign = ft_fsign(delta);                           // DELTA_PLUS or DELTA_MINUS or DELTA_ZERO
+    solution->delta_absolute = ft_fabs(delta);                        // |Δ|
+    delta_sqrt = ft_sqrt(solution->delta_absolute, DOUBLE_PRECISION); // √|Δ|
+    solution->delta_sqrt = delta_sqrt;
 
     /**
      * SOLVE LEFT AND RIGHT TERMS AS DOUBLES
@@ -41,7 +41,7 @@ static void solve_degree_2(s_solution_degree_2 *solution, double a, double b, do
     if (!is_nearly_equal_zero(b))
         solution->left_term = positiv_zero(-b / (2 * a)); // -b / 2a
     if (!is_nearly_equal_zero(delta))
-        solution->right_term = positiv_zero(delta_sqrt / 2 * a); // √|Δ| / 2a
+        solution->right_term = positiv_zero(delta_sqrt / (2 * a)); // √|Δ| / 2a
 
     /**
      * COMPLEX : SOLVE TERMS AS FRACTIONS
diff --git a/tester.sh b/tester.sh
index 57a2fd6..8373a04 100644
--- a/tester.sh
+++ b/tester.sh
@@ -50,6 +50,7 @@ while [[ "$#" -gt 0 ]]; do
         --skip-solution) SKIP_SOLUTION=true ;;
         --run-only) RUN_ONLY=true ;;
         -b) FLAGS="$FLAGS -b" ;; # append -b to FLAGS
+        -d) FLAGS="$FLAGS -d" ;; # append -d to FLAGS
         *) echo "Unknown parameter passed: $1"; exit 1 ;;
     esac
     shift
@@ -197,183 +198,192 @@ The polynomial degree is strictly greater than 2, I can't solve."
 run_test \
 "9. degree 2" \
 "3x² + 2x -7x¹ = x" "\
-Reduced form: 7 * x^0 + 1 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Discriminant is strictly negative, the two complex solutions are:
--1/6 + 9.11043i/6
--1/6 - 9.11043i/6"
-
-run_test \
-"10. degree 2" \
-"3x² + 2x -7 = x" "\
-Reduced form: 7 * x^0 + 1 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Discriminant is strictly negative, the two complex solutions are:
--1/6 + 9.11043i/6
--1/6 - 9.11043i/6"
-
-run_test \
-"11. degree 2" \
-"-3x² + 2x -7 = x" "\
-Reduced form: 7 * x^0 + 1 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Discriminant is strictly negative, the two complex solutions are:
--1/6 + 9.11043i/6
--1/6 - 9.11043i/6"
-
-run_test \
-"12. degree 2" \
-"+3x² + 2x -7 = x" "\
-Reduced form: 7 * x^0 + 1 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Discriminant is strictly negative, the two complex solutions are:
--1/6 + 9.11043i/6
--1/6 - 9.11043i/6"
-
-run_test \
-"13. degree 2" \
-"3x² + 0x -7 = x" "\
-Reduced form: -7 * x^0 - 1 * x^1 + 3 * x^2 = 0
+Reduced form: 0 * x^0 - 6 * x^1 + 3 * x^2 = 0
 Polynomial degree: 2
 Discriminant is strictly positive, the two solutions are:
-1.369924
--1.369924"
+0
+2"
 
-run_test \
-"14. degree 2" \
-"3x² + 0x -0 = x" "\
-Reduced form: 0 * x^0 - 1 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Discriminant is strictly positive, the two solutions are:
-1.66667
--1.33333"
+# run_test \
+# "10. degree 2" \
+# "3 * x^2 + 2 * x - 7 * x^1 = x" "\
+# Reduced form: 0 * x^0 - 6 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly positive, the two solutions are:
+# 2
+# 0"
 
-run_test \
-"15. degree 2" \
-"3x² + 2x -0 = x" "\
-Reduced form: 0 * x^0 + 1 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Discriminant is strictly positive, the two solutions are:
-1.33333
--1.66667"
+# run_test \
+# "11. degree 2" \
+# "-3x² + 2x -7 = x" "\
+# Reduced form: -7 * x^0 + 1 * x^1 - 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly negative, the two complex solutions are:
+# 0.166667 - 1.51841*i
+# 0.166667 + 1.51841*i"
 
-run_test \
-"16. degree 1" \
-"3x + 2x -0 = x" "\
-Reduced form: 0 * x^0 + 4 * x^1 = 0
-Polynomial degree: 1
-The solution is:
-0"
+# run_test \
+# "12. degree 2" \
+# "+3x² + 2x -7 = x" "\
+# Reduced form: -7 * x^0 + 1 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly positive, the two solutions are:
+# 1.36992
+# -1.70326"
 
-run_test \
-"17. degree 2" \
-"3x² + x -0 = x" "\
-Reduced form: 0 * x^0 + 0 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Radicant is equal to zero, the solution is:
-0"
+# run_test \
+# "13. degree 2" \
+# "3x² + 0x -7 = x" "\
+# Reduced form: -7 * x^0 - 1 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly positive, the two solutions are:
+# 1.70326
+# -1.36992"
 
-run_test \
-"18. degree 2" \
-"0x² + x -0 = x" "\
-Reduced form: 0 * x^0 = 0
-Any real number is a solution."
+# run_test \
+# "14. degree 2" \
+# "3x² + 0x -0 = x" "\
+# Reduced form: 0 * x^0 - 1 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly positive, the two solutions are:
+# 0.333333
+# 0"
 
-run_test \
-"19. degree 5" \
-"2x⁵ + x -0 = -7x^5" "\
-Reduced form: 0 * x^0 + 1 * x^1 + 0 * x^2 + 0 * x^3 + 0 * x^4 + 9 * x^5 = 0
-Polynomial degree: 5
-The polynomial degree is strictly greater than 2, I can't solve."
+# run_test \
+# "15. degree 2" \
+# "3x² + 2x -0 = x" "\
+# Reduced form: 0 * x^0 + 1 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly positive, the two solutions are:
+# 0
+# -0.333333"
 
-run_test \
-"20. degree 1" \
-"2x + x -0 = -7x" "\
-Reduced form: 0 * x^0 + 10 * x^1 = 0
-Polynomial degree: 1
-The solution is:
-0"
+# run_test \
+# "16. degree 1" \
+# "3x + 2x -0 = x" "\
+# Reduced form: 0 * x^0 + 4 * x^1 = 0
+# Polynomial degree: 1
+# The solution is:
+# 0"
 
-run_test \
-"21. degree 1" \
-"2x + x -3 = -7x" "\
-Reduced form: -3 * x^0 + 10 * x^1 = 0
-Polynomial degree: 1
-The solution is:
-0.3"
+# run_test \
+# "17. degree 2" \
+# "3x² + x -0 = x" "\
+# Reduced form: 0 * x^0 + 0 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is equal to zero, the solution is:
+# 0"
 
-run_test \
-"22. degree 1" \
-"-2x + x -3 = -7x" "\
-Reduced form: -3 * x^0 + 6 * x^1 = 0
-Polynomial degree: 1
-The solution is:
-0.5"
+# run_test \
+# "18. degree 2" \
+# "0x² + x -0 = x" "\
+# Reduced form: 0 * x^0 = 0
+# Any real number is a solution."
 
-run_test \
-"23. degree 2 without [=]" \
-"3x^2" \
-"" \
-error
+# run_test \
+# "19. degree 5" \
+# "2x⁵ + x -0 = -7x^5" "\
+# Reduced form: 0 * x^0 + 1 * x^1 + 0 * x^2 + 0 * x^3 + 0 * x^4 + 9 * x^5 = 0
+# Polynomial degree: 5
+# The polynomial degree is strictly greater than 2, I can't solve."
 
-run_test \
-"24. degree 2" \
-"3x^2 = 0" "\
-Reduced form: 0 * x^0 + 0 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Radicant is equal to zero, the solution is:
-0"
+# run_test \
+# "20. degree 1" \
+# "2x + x -0 = -7x" "\
+# Reduced form: 0 * x^0 + 10 * x^1 = 0
+# Polynomial degree: 1
+# The solution is:
+# 0"
 
-run_test \
-"25. degree 2" \
-"3x^2 + 2 = 0" "\
-Reduced form: 2 * x^0 + 0 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Radicant is strictly negative, the two complex solutions are:
-i√(2/3)
--i√(2/3)"
+# run_test \
+# "21. degree 1" \
+# "2x + x -3 = -7x" "\
+# Reduced form: -3 * x^0 + 10 * x^1 = 0
+# Polynomial degree: 1
+# The solution is:
+# 0.3"
 
-run_test \
-"26. degree 2 pure" \
-"3 * x^2 + 5 * x^1 - 2 * x^0 = 5 * x" "\
-Reduced form: -2 * x^0 + 0 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Radicant is strictly positive, the two solutions are:
-√(2/3)
--√(2/3)"
+# run_test \
+# "22. degree 1" \
+# "-2x + x -3 = -7x" "\
+# Reduced form: -3 * x^0 + 6 * x^1 = 0
+# Polynomial degree: 1
+# The solution is:
+# 0.5"
 
-run_test \
-"27. degree 2 pure" \
-"9 * x^2 + 5 * x^1 - 2 * x^0 = 5 * x" "\
-Reduced form: -2 * x^0 + 0 * x^1 + 9 * x^2 = 0
-Polynomial degree: 2
-Radicant is strictly positive, the two solutions are:
-√(2)/3
--√(2)/3"
+# run_test \
+# "23. degree 2 without [=]" \
+# "3x^2" \
+# "" \
+# error
 
-run_test \
-"28. degree 2 pure" \
-"3 * x^2 + 5 * x^1 - 4 * x^0 = 5 * x" "\
-Reduced form: -4 * x^0 + 0 * x^1 + 3 * x^2 = 0
-Polynomial degree: 2
-Radicant is strictly positive, the two solutions are:
-2/√(3)
--2/√(3)"
+# run_test \
+# "24. degree 2" \
+# "3x^2 = 0" "\
+# Reduced form: 0 * x^0 + 0 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is equal to zero, the solution is:
+# 0"
 
-run_test \
-"29. degree 2 pure" \
-"16 * x^2 + 5 * x^1 - 4 * x^0 = 5 * x" "\
-Reduced form: -4 * x^0 + 0 * x^1 + 16 * x^2 = 0
-Polynomial degree: 2
-Radicant is strictly positive, the two solutions are:
-1/2
--1/2"
+# run_test \
+# "25. degree 2" \
+# "3x^2 + 2 = 0" "\
+# Reduced form: 2 * x^0 + 0 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is strictly negative, the two complex solutions are:
+# i√(2/3)
+# -i√(2/3)"
 
-run_test \
-"30. degree 2 pure" \
-"4 * x^2 + 5 * x^1 - 16 * x^0 = 5 * x" "\
-Reduced form: -16 * x^0 + 0 * x^1 + 4 * x^2 = 0
-Polynomial degree: 2
-Radicant is strictly positive, the two solutions are:
-2
--2"
+# run_test \
+# "26. degree 2 pure" \
+# "3 * x^2 + 5 * x^1 - 2 * x^0 = 5 * x" "\
+# Reduced form: -2 * x^0 + 0 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is strictly positive, the two solutions are:
+# √(2/3)
+# -√(2/3)"
+
+# run_test \
+# "27. degree 2 pure" \
+# "9 * x^2 + 5 * x^1 - 2 * x^0 = 5 * x" "\
+# Reduced form: -2 * x^0 + 0 * x^1 + 9 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is strictly positive, the two solutions are:
+# √(2)/3
+# -√(2)/3"
+
+# run_test \
+# "28. degree 2 pure" \
+# "3 * x^2 + 5 * x^1 - 4 * x^0 = 5 * x" "\
+# Reduced form: -4 * x^0 + 0 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is strictly positive, the two solutions are:
+# 2/√(3)
+# -2/√(3)"
+
+# run_test \
+# "29. degree 2 pure" \
+# "16 * x^2 + 5 * x^1 - 4 * x^0 = 5 * x" "\
+# Reduced form: -4 * x^0 + 0 * x^1 + 16 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is strictly positive, the two solutions are:
+# 1/2
+# -1/2"
+
+# run_test \
+# "30. degree 2 pure" \
+# "4 * x^2 + 5 * x^1 - 16 * x^0 = 5 * x" "\
+# Reduced form: -16 * x^0 + 0 * x^1 + 4 * x^2 = 0
+# Polynomial degree: 2
+# Radicant is strictly positive, the two solutions are:
+# 2
+# -2"
+
+# run_test \
+# "31. degree 2" \
+# "3x² + 2x -7 = x" "\
+# Reduced form: -7 * x^0 + 1 * x^1 + 3 * x^2 = 0
+# Polynomial degree: 2
+# Discriminant is strictly positive, the two solutions are:
+# 1.36992
+# -1.70326"