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x in (-oo:+oo)
1/20 = (x/20)*(20-x) // - (x/20)*(20-x)
1/20-((x/20)*(20-x)) = 0
1/20-1*1/20*x*(20-x) = 0
(-1*1/20*20*x*(20-x))/20+1/20 = 0
1-1*1/20*20*x*(20-x) = 0
x^2-20*x+1 = 0
x^2-20*x+1 = 0
x^2-20*x+1 = 0
DELTA = (-20)^2-(1*1*4)
DELTA = 396
DELTA > 0
x = (396^(1/2)+20)/(1*2) or x = (20-396^(1/2))/(1*2)
x = (6*11^(1/2)+20)/2 or x = (20-6*11^(1/2))/2
(x-((20-6*11^(1/2))/2))*(x-((6*11^(1/2)+20)/2)) = 0
((x-((20-6*11^(1/2))/2))*(x-((6*11^(1/2)+20)/2)))/20 = 0
((x-((20-6*11^(1/2))/2))*(x-((6*11^(1/2)+20)/2)))/20 = 0 // * 20
(x-((20-6*11^(1/2))/2))*(x-((6*11^(1/2)+20)/2)) = 0
( x-((20-6*11^(1/2))/2) )
x-((20-6*11^(1/2))/2) = 0 // + (20-6*11^(1/2))/2
x = (20-6*11^(1/2))/2
( x-((6*11^(1/2)+20)/2) )
x-((6*11^(1/2)+20)/2) = 0 // + (6*11^(1/2)+20)/2
x = (6*11^(1/2)+20)/2
x in { (20-6*11^(1/2))/2, (6*11^(1/2)+20)/2 }
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