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-(12=8a)=-100
We move all terms to the left:
-(12-(8a))=0
We add all the numbers together, and all the variables
-(-8a+12)=0
We get rid of parentheses
8a-12=0
We move all terms containing a to the left, all other terms to the right
8a=12
a=12/8
a=1+1/2
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