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15+6y=21+3y
We move all terms to the left:
15+6y-(21+3y)=0
We add all the numbers together, and all the variables
6y-(3y+21)+15=0
We get rid of parentheses
6y-3y-21+15=0
We add all the numbers together, and all the variables
3y-6=0
We move all terms containing y to the left, all other terms to the right
3y=6
y=6/3
y=2
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