90=x+x

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Solution for 90=x+x equation: 



90=x+x

We move all terms to the left:

90-(x+x)=0

We add all the numbers together, and all the variables

-(+2x)+90=0

We get rid of parentheses

-2x+90=0

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

-2x=-90

x=-90/-2

x=+45

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