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72=13y-5y
We move all terms to the left:
72-(13y-5y)=0
We add all the numbers together, and all the variables
-(+8y)+72=0
We get rid of parentheses
-8y+72=0
We move all terms containing y to the left, all other terms to the right
-8y=-72
y=-72/-8
y=+9
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