90=x-20

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Solution for 90=x-20 equation: 



90=x-20

We move all terms to the left:

90-(x-20)=0

We get rid of parentheses

-x+20+90=0

We add all the numbers together, and all the variables

-1x+110=0

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

-x=-110

x=-110/-1

x=+110

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