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8a-8=3a+12
We move all terms to the left:
8a-8-(3a+12)=0
We get rid of parentheses
8a-3a-12-8=0
We add all the numbers together, and all the variables
5a-20=0
We move all terms containing a to the left, all other terms to the right
5a=20
a=20/5
a=4
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