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60=12a-108
We move all terms to the left:
60-(12a-108)=0
We get rid of parentheses
-12a+108+60=0
We add all the numbers together, and all the variables
-12a+168=0
We move all terms containing a to the left, all other terms to the right
-12a=-168
a=-168/-12
a=+14
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