12-3a=2a-a

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Solution for 12-3a=2a-a equation: 



12-3a=2a-a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-3a-a+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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