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24=15y-7y
We move all terms to the left:
24-(15y-7y)=0
We add all the numbers together, and all the variables
-(+8y)+24=0
We get rid of parentheses
-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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