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y/2-9=12
We move all terms to the left:
y/2-9-(12)=0
We add all the numbers together, and all the variables
y/2-21=0
We multiply all the terms by the denominator
y-21*2=0
We add all the numbers together, and all the variables
y-42=0
We move all terms containing y to the left, all other terms to the right
y=42
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