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y=720-320+0.8y
We move all terms to the left:
y-(720-320+0.8y)=0
We add all the numbers together, and all the variables
y-(0.8y+400)=0
We get rid of parentheses
y-0.8y-400=0
We add all the numbers together, and all the variables
0.2y-400=0
We move all terms containing y to the left, all other terms to the right
0.2y=400
y=400/0.2
y=2000
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