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4y=9y-15
We move all terms to the left:
4y-(9y-15)=0
We get rid of parentheses
4y-9y+15=0
We add all the numbers together, and all the variables
-5y+15=0
We move all terms containing y to the left, all other terms to the right
-5y=-15
y=-15/-5
y=+3
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