x-.20x=100

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Solution for x-.20x=100 equation: 


Simplifying
x + -0.20x = 100

Combine like terms: x + -0.20x = 0.8x
0.8x = 100

Solving
0.8x = 100

Solving for variable 'x'.

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

Divide each side by '0.8'.
x = 125

Simplifying
x = 125

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