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20x-x^2=3500
We move all terms to the left:
20x-x^2-(3500)=0
We add all the numbers together, and all the variables
-1x^2+20x-3500=0
a = -1; b = 20; c = -3500;
Δ = b2-4ac
Δ = 202-4·(-1)·(-3500)
Δ = -13600
Delta is less than zero, so there is no solution for the equation
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