a+2a+a=12

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Solution for a+2a+a=12 equation: 



a+2a+a=12

We move all terms to the left:

a+2a+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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