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9y+15=15y+3
We move all terms to the left:
9y+15-(15y+3)=0
We get rid of parentheses
9y-15y-3+15=0
We add all the numbers together, and all the variables
-6y+12=0
We move all terms containing y to the left, all other terms to the right
-6y=-12
y=-12/-6
y=+2
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