x-(0.8x)=20

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Solution for x-(0.8x)=20 equation: 


Simplifying
x + -1(0.8x) = 20

Remove parenthesis around (0.8x)
x + -1 * 0.8x = 20

Multiply -1 * 0.8
x + -0.8x = 20

Combine like terms: x + -0.8x = 0.2x
0.2x = 20

Solving
0.2x = 20

Solving for variable 'x'.

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

Divide each side by '0.2'.
x = 100

Simplifying
x = 100

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