90=(n+18)

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Solution for 90=(n+18) equation: 



90=(n+18)

We move all terms to the left:

90-((n+18))=0



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

(n+18)

We get rid of parentheses

n+18

Back to the equation:

-(n+18)



We get rid of parentheses

-n-18+90=0

We add all the numbers together, and all the variables

-1n+72=0

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

-n=-72

n=-72/-1

n=+72

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