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30+Y+0.3Y+0.4Y=8000
We move all terms to the left:
30+Y+0.3Y+0.4Y-(8000)=0
We add all the numbers together, and all the variables
1.7Y-7970=0
We move all terms containing Y to the left, all other terms to the right
1.7Y=7970
Y=7970/1.7
Y=4688+0.400000000001/1.7
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