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800-10(240)+.25(240)^2=x
We move all terms to the left:
800-10(240)+.25(240)^2-(x)=0
We add all the numbers together, and all the variables
-1x-9439.93629424=0
We move all terms containing x to the left, all other terms to the right
-x=9439.93629424
x=9439.93629424/-1
x=-9439+0.93629424/1
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