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18+y/2=9
We move all terms to the left:
18+y/2-(9)=0
We add all the numbers together, and all the variables
y/2+9=0
We multiply all the terms by the denominator
y+9*2=0
We add all the numbers together, and all the variables
y+18=0
We move all terms containing y to the left, all other terms to the right
y=-18
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