-15-2a+7a=7a+6+5a

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Solution for -15-2a+7a=7a+6+5a equation: 



-15-2a+7a=7a+6+5a

We move all terms to the left:

-15-2a+7a-(7a+6+5a)=0

We add all the numbers together, and all the variables

-2a+7a-(12a+6)-15=0

We add all the numbers together, and all the variables

5a-(12a+6)-15=0

We get rid of parentheses

5a-12a-6-15=0

We add all the numbers together, and all the variables

-7a-21=0

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

-7a=21

a=21/-7

a=-3

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