-108=-9(r+4)

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Solution for -108=-9(r+4) equation: 



-108=-9(r+4)

We move all terms to the left:

-108-(-9(r+4))=0



We calculate terms in parentheses: -(-9(r+4)), so:

-9(r+4)

We multiply parentheses

-9r-36

Back to the equation:

-(-9r-36)



We get rid of parentheses

9r+36-108=0

We add all the numbers together, and all the variables

9r-72=0

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

9r=72

r=72/9

r=8

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