2(a+3)-a=-12

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



2(a+3)-a=-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1a+2(a+3)+12=0

We multiply parentheses

-1a+2a+6+12=0

We add all the numbers together, and all the variables

a+18=0

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

a=-18

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