18=9(r-88)

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Solution for 18=9(r-88) equation: 



18=9(r-88)

We move all terms to the left:

18-(9(r-88))=0



We calculate terms in parentheses: -(9(r-88)), so:

9(r-88)

We multiply parentheses

9r-792

Back to the equation:

-(9r-792)



We get rid of parentheses

-9r+792+18=0

We add all the numbers together, and all the variables

-9r+810=0

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

-9r=-810

r=-810/-9

r=+90

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