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0.15y+0.05(y+6000)=900
We move all terms to the left:
0.15y+0.05(y+6000)-(900)=0
We multiply parentheses
0.15y+0.05y+300-900=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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