3x^2-42+9=-5

Solution for 3x^2-42+9=-5 equation:

Simplifying
3x2 + -42 + 9 = -5

Reorder the terms:
-42 + 9 + 3x2 = -5

Combine like terms: -42 + 9 = -33
-33 + 3x2 = -5

Solving
-33 + 3x2 = -5

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '33' to each side of the equation.
-33 + 33 + 3x2 = -5 + 33

Combine like terms: -33 + 33 = 0
0 + 3x2 = -5 + 33
3x2 = -5 + 33

Combine like terms: -5 + 33 = 28
3x2 = 28

Divide each side by '3'.
x2 = 9.333333333

Simplifying
x2 = 9.333333333

Take the square root of each side:
x = {-3.055050463, 3.055050463}