-120=-8(2r+1)

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Solution for -120=-8(2r+1) equation: 



-120=-8(2r+1)

We move all terms to the left:

-120-(-8(2r+1))=0



We calculate terms in parentheses: -(-8(2r+1)), so:

-8(2r+1)

We multiply parentheses

-16r-8

Back to the equation:

-(-16r-8)



We get rid of parentheses

16r+8-120=0

We add all the numbers together, and all the variables

16r-112=0

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

16r=112

r=112/16

r=7

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