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18=y/3-15
We move all terms to the left:
18-(y/3-15)=0
We get rid of parentheses
-y/3+15+18=0
We multiply all the terms by the denominator
-y+15*3+18*3=0
We add all the numbers together, and all the variables
-1y+99=0
We move all terms containing y to the left, all other terms to the right
-y=-99
y=-99/-1
y=+99
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