-15a=-(6+12a)-(9-2a)

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Solution for -15a=-(6+12a)-(9-2a) equation: 



-15a=-(6+12a)-(9-2a)

We move all terms to the left:

-15a-(-(6+12a)-(9-2a))=0

We add all the numbers together, and all the variables

-15a-(-(12a+6)-(-2a+9))=0



We calculate terms in parentheses: -(-(12a+6)-(-2a+9)), so:

-(12a+6)-(-2a+9)

We get rid of parentheses

-12a+2a-6-9

We add all the numbers together, and all the variables

-10a-15

Back to the equation:

-(-10a-15)



We get rid of parentheses

-15a+10a+15=0

We add all the numbers together, and all the variables

-5a+15=0

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

-5a=-15

a=-15/-5

a=+3

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