-9=-3(r+12)

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Solution for -9=-3(r+12) equation: 



-9=-3(r+12)

We move all terms to the left:

-9-(-3(r+12))=0



We calculate terms in parentheses: -(-3(r+12)), so:

-3(r+12)

We multiply parentheses

-3r-36

Back to the equation:

-(-3r-36)



We get rid of parentheses

3r+36-9=0

We add all the numbers together, and all the variables

3r+27=0

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

3r=-27

r=-27/3

r=-9

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