21=7(r-88)

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Solution for 21=7(r-88) equation: 



21=7(r-88)

We move all terms to the left:

21-(7(r-88))=0



We calculate terms in parentheses: -(7(r-88)), so:

7(r-88)

We multiply parentheses

7r-616

Back to the equation:

-(7r-616)



We get rid of parentheses

-7r+616+21=0

We add all the numbers together, and all the variables

-7r+637=0

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

-7r=-637

r=-637/-7

r=+91

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