x(0.2x)=750

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Solution for x(0.2x)=750 equation: 


Simplifying
x(0.2x) = 750

Remove parenthesis around (0.2x)
x * 0.2x = 750

Reorder the terms for easier multiplication:
0.2x * x = 750

Multiply x * x
0.2x2 = 750

Solving
0.2x2 = 750

Solving for variable 'x'.

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

Divide each side by '0.2'.
x2 = 3750

Simplifying
x2 = 3750

Take the square root of each side:
x = {-61.23724357, 61.23724357}

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