-84=-2(5r+2)

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Solution for -84=-2(5r+2) equation: 



-84=-2(5r+2)

We move all terms to the left:

-84-(-2(5r+2))=0



We calculate terms in parentheses: -(-2(5r+2)), so:

-2(5r+2)

We multiply parentheses

-10r-4

Back to the equation:

-(-10r-4)



We get rid of parentheses

10r+4-84=0

We add all the numbers together, and all the variables

10r-80=0

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

10r=80

r=80/10

r=8

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