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9y+15=3y-9
We move all terms to the left:
9y+15-(3y-9)=0
We get rid of parentheses
9y-3y+9+15=0
We add all the numbers together, and all the variables
6y+24=0
We move all terms containing y to the left, all other terms to the right
6y=-24
y=-24/6
y=-4
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