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12=y/4+15
We move all terms to the left:
12-(y/4+15)=0
We get rid of parentheses
-y/4-15+12=0
We multiply all the terms by the denominator
-y-15*4+12*4=0
We add all the numbers together, and all the variables
-1y-12=0
We move all terms containing y to the left, all other terms to the right
-y=12
y=12/-1
y=-12
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