-84=-7(r+8)+3r

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Solution for -84=-7(r+8)+3r equation: 



-84=-7(r+8)+3r

We move all terms to the left:

-84-(-7(r+8)+3r)=0



We calculate terms in parentheses: -(-7(r+8)+3r), so:

-7(r+8)+3r

We add all the numbers together, and all the variables

3r-7(r+8)

We multiply parentheses

3r-7r-56

We add all the numbers together, and all the variables

-4r-56

Back to the equation:

-(-4r-56)



We get rid of parentheses

4r+56-84=0

We add all the numbers together, and all the variables

4r-28=0

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

4r=28

r=28/4

r=7

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