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-0.09y+0.08(9000-y)=0.08y
We move all terms to the left:
-0.09y+0.08(9000-y)-(0.08y)=0
We add all the numbers together, and all the variables
-0.09y+0.08(-1y+9000)-(+0.08y)=0
We multiply parentheses
-0.09y-0.08y-(+0.08y)+720=0
We get rid of parentheses
-0.09y-0.08y-0.08y+720=0
We add all the numbers together, and all the variables
-0.25y+720=0
We move all terms containing y to the left, all other terms to the right
-0.25y=-720
y=-720/-0.25
y=+2880
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