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15=y/8+9
We move all terms to the left:
15-(y/8+9)=0
We get rid of parentheses
-y/8-9+15=0
We multiply all the terms by the denominator
-y-9*8+15*8=0
We add all the numbers together, and all the variables
-1y+48=0
We move all terms containing y to the left, all other terms to the right
-y=-48
y=-48/-1
y=+48
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