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4y=21+y
We move all terms to the left:
4y-(21+y)=0
We add all the numbers together, and all the variables
4y-(y+21)=0
We get rid of parentheses
4y-y-21=0
We add all the numbers together, and all the variables
3y-21=0
We move all terms containing y to the left, all other terms to the right
3y=21
y=21/3
y=7
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