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