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6a-12=3a-6
We move all terms to the left:
6a-12-(3a-6)=0
We get rid of parentheses
6a-3a+6-12=0
We add all the numbers together, and all the variables
3a-6=0
We move all terms containing a to the left, all other terms to the right
3a=6
a=6/3
a=2
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