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2y=3y+21
We move all terms to the left:
2y-(3y+21)=0
We get rid of parentheses
2y-3y-21=0
We add all the numbers together, and all the variables
-1y-21=0
We move all terms containing y to the left, all other terms to the right
-y=21
y=21/-1
y=-21
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