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1720=120+y
We move all terms to the left:
1720-(120+y)=0
We add all the numbers together, and all the variables
-(y+120)+1720=0
We get rid of parentheses
-y-120+1720=0
We add all the numbers together, and all the variables
-1y+1600=0
We move all terms containing y to the left, all other terms to the right
-y=-1600
y=-1600/-1
y=+1600
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