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12a+12=13a+6
We move all terms to the left:
12a+12-(13a+6)=0
We get rid of parentheses
12a-13a-6+12=0
We add all the numbers together, and all the variables
-1a+6=0
We move all terms containing a to the left, all other terms to the right
-a=-6
a=-6/-1
a=+6
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