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y/3-12=21
We move all terms to the left:
y/3-12-(21)=0
We add all the numbers together, and all the variables
y/3-33=0
We multiply all the terms by the denominator
y-33*3=0
We add all the numbers together, and all the variables
y-99=0
We move all terms containing y to the left, all other terms to the right
y=99
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