90=9(s+3)

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Solution for 90=9(s+3) equation: 



90=9(s+3)

We move all terms to the left:

90-(9(s+3))=0



We calculate terms in parentheses: -(9(s+3)), so:

9(s+3)

We multiply parentheses

9s+27

Back to the equation:

-(9s+27)



We get rid of parentheses

-9s-27+90=0

We add all the numbers together, and all the variables

-9s+63=0

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

-9s=-63

s=-63/-9

s=+7

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