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