12=a+3a

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Solution for 12=a+3a equation: 



12=a+3a

We move all terms to the left:

12-(a+3a)=0

We add all the numbers together, and all the variables

-(+4a)+12=0

We get rid of parentheses

-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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