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-15=y/3-18
We move all terms to the left:
-15-(y/3-18)=0
We get rid of parentheses
-y/3+18-15=0
We multiply all the terms by the denominator
-y+18*3-15*3=0
We add all the numbers together, and all the variables
-1y+9=0
We move all terms containing y to the left, all other terms to the right
-y=-9
y=-9/-1
y=+9
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