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=200+0.75Y+4000
We move all terms to the left:
-(200+0.75Y+4000)=0
We add all the numbers together, and all the variables
-(0.75Y+4200)=0
We get rid of parentheses
-0.75Y-4200=0
We move all terms containing Y to the left, all other terms to the right
-0.75Y=4200
Y=4200/-0.75
Y=-5600
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