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6y=9y+15
We move all terms to the left:
6y-(9y+15)=0
We get rid of parentheses
6y-9y-15=0
We add all the numbers together, and all the variables
-3y-15=0
We move all terms containing y to the left, all other terms to the right
-3y=15
y=15/-3
y=-5
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