12r+15=9(2r+13)

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Solution for 12r+15=9(2r+13) equation: 



12r+15=9(2r+13)

We move all terms to the left:

12r+15-(9(2r+13))=0



We calculate terms in parentheses: -(9(2r+13)), so:

9(2r+13)

We multiply parentheses

18r+117

Back to the equation:

-(18r+117)



We get rid of parentheses

12r-18r-117+15=0

We add all the numbers together, and all the variables

-6r-102=0

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

-6r=102

r=102/-6

r=-17

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