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42=y+15.
We move all terms to the left:
42-(y+15.)=0
We add all the numbers together, and all the variables
-(y+15)+42=0
We get rid of parentheses
-y-15+42=0
We add all the numbers together, and all the variables
-1y+27=0
We move all terms containing y to the left, all other terms to the right
-y=-27
y=-27/-1
y=+27
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