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-5y-9=-3y+15
We move all terms to the left:
-5y-9-(-3y+15)=0
We get rid of parentheses
-5y+3y-15-9=0
We add all the numbers together, and all the variables
-2y-24=0
We move all terms containing y to the left, all other terms to the right
-2y=24
y=24/-2
y=-12
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