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Simplifying
3x2 = 126
Solving
3x2 = 126
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '3'.
x2 = 42
Simplifying
x2 = 42
Take the square root of each side:
x = {-6.480740698, 6.480740698}
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