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4a-2=-12a
We move all terms to the left:
4a-2-(-12a)=0
We get rid of parentheses
4a+12a-2=0
We add all the numbers together, and all the variables
16a-2=0
We move all terms containing a to the left, all other terms to the right
16a=2
a=2/16
a=1/8
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