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3a-12=8a+6
We move all terms to the left:
3a-12-(8a+6)=0
We get rid of parentheses
3a-8a-6-12=0
We add all the numbers together, and all the variables
-5a-18=0
We move all terms containing a to the left, all other terms to the right
-5a=18
a=18/-5
a=-3+3/5
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