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2a-12=8a+4
We move all terms to the left:
2a-12-(8a+4)=0
We get rid of parentheses
2a-8a-4-12=0
We add all the numbers together, and all the variables
-6a-16=0
We move all terms containing a to the left, all other terms to the right
-6a=16
a=16/-6
a=-2+2/3
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