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27=18+y
We move all terms to the left:
27-(18+y)=0
We add all the numbers together, and all the variables
-(y+18)+27=0
We get rid of parentheses
-y-18+27=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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