-84=-3(5r+3)

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Solution for -84=-3(5r+3) equation: 



-84=-3(5r+3)

We move all terms to the left:

-84-(-3(5r+3))=0



We calculate terms in parentheses: -(-3(5r+3)), so:

-3(5r+3)

We multiply parentheses

-15r-9

Back to the equation:

-(-15r-9)



We get rid of parentheses

15r+9-84=0

We add all the numbers together, and all the variables

15r-75=0

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

15r=75

r=75/15

r=5

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