77=-7(r+4)

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Solution for 77=-7(r+4) equation: 



77=-7(r+4)

We move all terms to the left:

77-(-7(r+4))=0



We calculate terms in parentheses: -(-7(r+4)), so:

-7(r+4)

We multiply parentheses

-7r-28

Back to the equation:

-(-7r-28)



We get rid of parentheses

7r+28+77=0

We add all the numbers together, and all the variables

7r+105=0

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

7r=-105

r=-105/7

r=-15

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