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.13y+.05(y+9000)=1170
We move all terms to the left:
.13y+.05(y+9000)-(1170)=0
We multiply parentheses
.13y+0.05y+450-1170=0
We add all the numbers together, and all the variables
0.18y-720=0
We move all terms containing y to the left, all other terms to the right
0.18y=720
y=720/0.18
y=4000
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