90=64+x+x

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Solution for 90=64+x+x equation: 



90=64+x+x

We move all terms to the left:

90-(64+x+x)=0

We add all the numbers together, and all the variables

-(2x+64)+90=0

We get rid of parentheses

-2x-64+90=0

We add all the numbers together, and all the variables

-2x+26=0

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

-2x=-26

x=-26/-2

x=+13

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