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15+9y=6y+42
We move all terms to the left:
15+9y-(6y+42)=0
We get rid of parentheses
9y-6y-42+15=0
We add all the numbers together, and all the variables
3y-27=0
We move all terms containing y to the left, all other terms to the right
3y=27
y=27/3
y=9
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