-9a+6a=12a+15

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



-9a+6a=12a+15

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-3a-12a-15=0

We add all the numbers together, and all the variables

-15a-15=0

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

-15a=15

a=15/-15

a=-1

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