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-12a-8=-16a
We move all terms to the left:
-12a-8-(-16a)=0
We get rid of parentheses
-12a+16a-8=0
We add all the numbers together, and all the variables
4a-8=0
We move all terms containing a to the left, all other terms to the right
4a=8
a=8/4
a=2
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