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0=^2+20Y-8000
We move all terms to the left:
0-(^2+20Y-8000)=0
We add all the numbers together, and all the variables
-(^2+20Y-8000)=0
We get rid of parentheses
-20Y+8000-^2=0
We add all the numbers together, and all the variables
-20Y=0
Y=0/-20
Y=0
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