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Simplifying
3x(x) = 640
Multiply x * x
3x2 = 640
Solving
3x2 = 640
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '3'.
x2 = 213.3333333
Simplifying
x2 = 213.3333333
Take the square root of each side:
x = {-14.605934866, 14.605934866}
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