15=3(r+7)-12

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Solution for 15=3(r+7)-12 equation: 



15=3(r+7)-12

We move all terms to the left:

15-(3(r+7)-12)=0



We calculate terms in parentheses: -(3(r+7)-12), so:

3(r+7)-12

We multiply parentheses

3r+21-12

We add all the numbers together, and all the variables

3r+9

Back to the equation:

-(3r+9)



We get rid of parentheses

-3r-9+15=0

We add all the numbers together, and all the variables

-3r+6=0

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

-3r=-6

r=-6/-3

r=+2

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