-3x^2=-216

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Solution for -3x^2=-216 equation: 


Simplifying
-3x2 = -216

Solving
-3x2 = -216

Solving for variable 'x'.

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

Divide each side by '-3'.
x2 = 72

Simplifying
x2 = 72

Take the square root of each side:
x = {-8.485281374, 8.485281374}

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