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Simplifying
3 + -6x2 = -393
Solving
3 + -6x2 = -393
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-3' to each side of the equation.
3 + -3 + -6x2 = -393 + -3
Combine like terms: 3 + -3 = 0
0 + -6x2 = -393 + -3
-6x2 = -393 + -3
Combine like terms: -393 + -3 = -396
-6x2 = -396
Divide each side by '-6'.
x2 = 66
Simplifying
x2 = 66
Take the square root of each side:
x = {-8.124038405, 8.124038405}
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