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9y+15=3y-15
We move all terms to the left:
9y+15-(3y-15)=0
We get rid of parentheses
9y-3y+15+15=0
We add all the numbers together, and all the variables
6y+30=0
We move all terms containing y to the left, all other terms to the right
6y=-30
y=-30/6
y=-5
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