3(r+3)=-12

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



3(r+3)=-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(r+3)+12=0

We multiply parentheses

3r+9+12=0

We add all the numbers together, and all the variables

3r+21=0

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

3r=-21

r=-21/3

r=-7

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