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8a=12+7a*
We move all terms to the left:
8a-(12+7a*)=0
We add all the numbers together, and all the variables
8a-(7a*+12)=0
We get rid of parentheses
8a-7a*-12=0
We move all terms containing a to the left, all other terms to the right
8a-7a*=12
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