-2a+12+4a=9a-3a

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Solution for -2a+12+4a=9a-3a equation: 



-2a+12+4a=9a-3a

We move all terms to the left:

-2a+12+4a-(9a-3a)=0

We add all the numbers together, and all the variables

-2a+4a-(+6a)+12=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2a-6a+12=0

We add all the numbers together, and all the variables

-4a+12=0

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

-4a=-12

a=-12/-4

a=+3

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