90=2x+(18+x)

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Solution for 90=2x+(18+x) equation: 



90=2x+(18+x)

We move all terms to the left:

90-(2x+(18+x))=0

We add all the numbers together, and all the variables

-(2x+(x+18))+90=0



We calculate terms in parentheses: -(2x+(x+18)), so:

2x+(x+18)

We get rid of parentheses

2x+x+18

We add all the numbers together, and all the variables

3x+18

Back to the equation:

-(3x+18)



We get rid of parentheses

-3x-18+90=0

We add all the numbers together, and all the variables

-3x+72=0

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

-3x=-72

x=-72/-3

x=+24

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