-15=5a+12-2a+6

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Solution for -15=5a+12-2a+6 equation: 



-15=5a+12-2a+6

We move all terms to the left:

-15-(5a+12-2a+6)=0

We add all the numbers together, and all the variables

-(3a+18)-15=0

We get rid of parentheses

-3a-18-15=0

We add all the numbers together, and all the variables

-3a-33=0

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

-3a=33

a=33/-3

a=-11

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