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15-6a=12a+18
We move all terms to the left:
15-6a-(12a+18)=0
We get rid of parentheses
-6a-12a-18+15=0
We add all the numbers together, and all the variables
-18a-3=0
We move all terms containing a to the left, all other terms to the right
-18a=3
a=3/-18
a=-1/6
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