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13y-15=5y+9
We move all terms to the left:
13y-15-(5y+9)=0
We get rid of parentheses
13y-5y-9-15=0
We add all the numbers together, and all the variables
8y-24=0
We move all terms containing y to the left, all other terms to the right
8y=24
y=24/8
y=3
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