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18=y/2-13
We move all terms to the left:
18-(y/2-13)=0
We get rid of parentheses
-y/2+13+18=0
We multiply all the terms by the denominator
-y+13*2+18*2=0
We add all the numbers together, and all the variables
-1y+62=0
We move all terms containing y to the left, all other terms to the right
-y=-62
y=-62/-1
y=+62
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