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3a=12+2a

We move all terms to the left:

3a-(12+2a)=0

We add all the numbers together, and all the variables

3a-(2a+12)=0

We get rid of parentheses

3a-2a-12=0

We add all the numbers together, and all the variables

a-12=0

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

a=12

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