-12=2(a+3)

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Solution for -12=2(a+3) equation: 



-12=2(a+3)

We move all terms to the left:

-12-(2(a+3))=0



We calculate terms in parentheses: -(2(a+3)), so:

2(a+3)

We multiply parentheses

2a+6

Back to the equation:

-(2a+6)



We get rid of parentheses

-2a-6-12=0

We add all the numbers together, and all the variables

-2a-18=0

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

-2a=18

a=18/-2

a=-9

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