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12=n/3+3
We move all terms to the left:
12-(n/3+3)=0
We get rid of parentheses
-n/3-3+12=0
We multiply all the terms by the denominator
-n-3*3+12*3=0
We add all the numbers together, and all the variables
-1n+27=0
We move all terms containing n to the left, all other terms to the right
-n=-27
n=-27/-1
n=+27
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