-77=7(r-8)

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Solution for -77=7(r-8) equation: 



-77=7(r-8)

We move all terms to the left:

-77-(7(r-8))=0



We calculate terms in parentheses: -(7(r-8)), so:

7(r-8)

We multiply parentheses

7r-56

Back to the equation:

-(7r-56)



We get rid of parentheses

-7r+56-77=0

We add all the numbers together, and all the variables

-7r-21=0

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

-7r=21

r=21/-7

r=-3

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