-120=-10(-8+r)

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Solution for -120=-10(-8+r) equation: 



-120=-10(-8+r)

We move all terms to the left:

-120-(-10(-8+r))=0

We add all the numbers together, and all the variables

-(-10(r-8))-120=0



We calculate terms in parentheses: -(-10(r-8)), so:

-10(r-8)

We multiply parentheses

-10r+80

Back to the equation:

-(-10r+80)



We get rid of parentheses

10r-80-120=0

We add all the numbers together, and all the variables

10r-200=0

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

10r=200

r=200/10

r=20

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