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0.13y+0.04(y+4000)=1520
We move all terms to the left:
0.13y+0.04(y+4000)-(1520)=0
We multiply parentheses
0.13y+0.04y+160-1520=0
We add all the numbers together, and all the variables
0.17y-1360=0
We move all terms containing y to the left, all other terms to the right
0.17y=1360
y=1360/0.17
y=7999+0.16999999999985/0.17
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