90=x+x-18

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Solution for 90=x+x-18 equation: 



90=x+x-18

We move all terms to the left:

90-(x+x-18)=0

We add all the numbers together, and all the variables

-(2x-18)+90=0

We get rid of parentheses

-2x+18+90=0

We add all the numbers together, and all the variables

-2x+108=0

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

-2x=-108

x=-108/-2

x=+54

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