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1000+0.6(y-400)+1400=2640
We move all terms to the left:
1000+0.6(y-400)+1400-(2640)=0
We add all the numbers together, and all the variables
0.6(y-400)-240=0
We multiply parentheses
0.6y-240-240=0
We add all the numbers together, and all the variables
0.6y-480=0
We move all terms containing y to the left, all other terms to the right
0.6y=480
y=480/0.6
y=800
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