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0.11y+0.04(y+2000)=1280
We move all terms to the left:
0.11y+0.04(y+2000)-(1280)=0
We multiply parentheses
0.11y+0.04y+80-1280=0
We add all the numbers together, and all the variables
0.15y-1200=0
We move all terms containing y to the left, all other terms to the right
0.15y=1200
y=1200/0.15
y=8000
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