12+15a=3(6a-9)

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Solution for 12+15a=3(6a-9) equation: 



12+15a=3(6a-9)

We move all terms to the left:

12+15a-(3(6a-9))=0



We calculate terms in parentheses: -(3(6a-9)), so:

3(6a-9)

We multiply parentheses

18a-27

Back to the equation:

-(18a-27)



We get rid of parentheses

15a-18a+27+12=0

We add all the numbers together, and all the variables

-3a+39=0

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

-3a=-39

a=-39/-3

a=+13

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