90=x-0.8x

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Solution for 90=x-0.8x equation: 



90=x-0.8x

We move all terms to the left:

90-(x-0.8x)=0

We add all the numbers together, and all the variables

-(+0.2x)+90=0

We get rid of parentheses

-0.2x+90=0

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

-0.2x=-90

x=-90/-0.2

x=+450

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