-87=-3(r+8)

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Solution for -87=-3(r+8) equation: 



-87=-3(r+8)

We move all terms to the left:

-87-(-3(r+8))=0



We calculate terms in parentheses: -(-3(r+8)), so:

-3(r+8)

We multiply parentheses

-3r-24

Back to the equation:

-(-3r-24)



We get rid of parentheses

3r+24-87=0

We add all the numbers together, and all the variables

3r-63=0

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

3r=63

r=63/3

r=21

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