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12=y/2-15
We move all terms to the left:
12-(y/2-15)=0
We get rid of parentheses
-y/2+15+12=0
We multiply all the terms by the denominator
-y+15*2+12*2=0
We add all the numbers together, and all the variables
-1y+54=0
We move all terms containing y to the left, all other terms to the right
-y=-54
y=-54/-1
y=+54
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