90=9(r+7)

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Solution for 90=9(r+7) equation: 



90=9(r+7)

We move all terms to the left:

90-(9(r+7))=0



We calculate terms in parentheses: -(9(r+7)), so:

9(r+7)

We multiply parentheses

9r+63

Back to the equation:

-(9r+63)



We get rid of parentheses

-9r-63+90=0

We add all the numbers together, and all the variables

-9r+27=0

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

-9r=-27

r=-27/-9

r=+3

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