-10=-5(r-8)

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Solution for -10=-5(r-8) equation: 



-10=-5(r-8)

We move all terms to the left:

-10-(-5(r-8))=0



We calculate terms in parentheses: -(-5(r-8)), so:

-5(r-8)

We multiply parentheses

-5r+40

Back to the equation:

-(-5r+40)



We get rid of parentheses

5r-40-10=0

We add all the numbers together, and all the variables

5r-50=0

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

5r=50

r=50/5

r=10

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