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