x-x(.20)=100

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Solution for x-x(.20)=100 equation: 



x-x(.20)=100

We move all terms to the left:

x-x(.20)-(100)=0

We add all the numbers together, and all the variables

x-x(0.2)-100=0

We multiply parentheses

x-0.2x-100=0

We add all the numbers together, and all the variables

0.8x-100=0

We move all terms containing x to the left, all other terms to the right

0.8x=100

x=100/0.8

x=125

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