100=x-0.2x

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Solution for 100=x-0.2x equation: 



100=x-0.2x

We move all terms to the left:

100-(x-0.2x)=0

We add all the numbers together, and all the variables

-(+0.8x)+100=0

We get rid of parentheses

-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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