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15=a/3+12
We move all terms to the left:
15-(a/3+12)=0
We get rid of parentheses
-a/3-12+15=0
We multiply all the terms by the denominator
-a-12*3+15*3=0
We add all the numbers together, and all the variables
-1a+9=0
We move all terms containing a to the left, all other terms to the right
-a=-9
a=-9/-1
a=+9
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