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72=13y-4y
We move all terms to the left:
72-(13y-4y)=0
We add all the numbers together, and all the variables
-(+9y)+72=0
We get rid of parentheses
-9y+72=0
We move all terms containing y to the left, all other terms to the right
-9y=-72
y=-72/-9
y=+8
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