12+3a=a

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Solution for 12+3a=a equation: 



12+3a=a

We move all terms to the left:

12+3a-(a)=0

We add all the numbers together, and all the variables

2a+12=0

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

2a=-12

a=-12/2

a=-6

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