-2a=12+a

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Solution for -2a=12+a equation: 



-2a=12+a

We move all terms to the left:

-2a-(12+a)=0

We add all the numbers together, and all the variables

-2a-(a+12)=0

We get rid of parentheses

-2a-a-12=0

We add all the numbers together, and all the variables

-3a-12=0

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

-3a=12

a=12/-3

a=-4

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