(x+x)*x=20

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Solution for (x+x)*x=20 equation: 


Simplifying
(x + x) * x = 20

Combine like terms: x + x = 2x
(2x) * x = 20

Remove parenthesis around (2x)
2x * x = 20

Multiply x * x
2x2 = 20

Solving
2x2 = 20

Solving for variable 'x'.

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

Divide each side by '2'.
x2 = 10

Simplifying
x2 = 10

Take the square root of each side:
x = {-3.16227766, 3.16227766}

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