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-0.07y+0.09(4000-y)=0.34y
We move all terms to the left:
-0.07y+0.09(4000-y)-(0.34y)=0
We add all the numbers together, and all the variables
-0.07y+0.09(-1y+4000)-(+0.34y)=0
We multiply parentheses
-0.07y-0.09y-(+0.34y)+360=0
We get rid of parentheses
-0.07y-0.09y-0.34y+360=0
We add all the numbers together, and all the variables
-0.5y+360=0
We move all terms containing y to the left, all other terms to the right
-0.5y=-360
y=-360/-0.5
y=+720
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