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15=y/3+8
We move all terms to the left:
15-(y/3+8)=0
We get rid of parentheses
-y/3-8+15=0
We multiply all the terms by the denominator
-y-8*3+15*3=0
We add all the numbers together, and all the variables
-1y+21=0
We move all terms containing y to the left, all other terms to the right
-y=-21
y=-21/-1
y=+21
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