90=(x+20)

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Solution for 90=(x+20) equation: 



90=(x+20)

We move all terms to the left:

90-((x+20))=0



We calculate terms in parentheses: -((x+20)), so:

(x+20)

We get rid of parentheses

x+20

Back to the equation:

-(x+20)



We get rid of parentheses

-x-20+90=0

We add all the numbers together, and all the variables

-1x+70=0

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

-x=-70

x=-70/-1

x=+70

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