90=2x-x

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Solution for 90=2x-x equation: 



90=2x-x

We move all terms to the left:

90-(2x-x)=0

We add all the numbers together, and all the variables

-(+x)+90=0

We get rid of parentheses

-x+90=0

We add all the numbers together, and all the variables

-1x+90=0

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

-x=-90

x=-90/-1

x=+90

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