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0.75y-0.5y=4000
We move all terms to the left:
0.75y-0.5y-(4000)=0
We add all the numbers together, and all the variables
0.25y-4000=0
We move all terms containing y to the left, all other terms to the right
0.25y=4000
y=4000/0.25
y=16000
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