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5y-3=y+21
We move all terms to the left:
5y-3-(y+21)=0
We get rid of parentheses
5y-y-21-3=0
We add all the numbers together, and all the variables
4y-24=0
We move all terms containing y to the left, all other terms to the right
4y=24
y=24/4
y=6
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