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0.17y+0.03(y+4000)=720
We move all terms to the left:
0.17y+0.03(y+4000)-(720)=0
We multiply parentheses
0.17y+0.03y+120-720=0
We add all the numbers together, and all the variables
0.2y-600=0
We move all terms containing y to the left, all other terms to the right
0.2y=600
y=600/0.2
y=3000
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