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D( x )
x-0.04 = 0
x-0.04 = 0
x-0.04 = 0
x-0.04 = 0 // + 0.04
x = 0.04
x in (-oo:0.04) U (0.04:+oo)
50 = 2.5/(x-0.04) // - 2.5/(x-0.04)
50-(2.5/(x-0.04)) = 0
50-2.5*(x-0.04)^-1 = 0
50-2.5/(x-0.04) = 0
(50*(x-0.04))/(x-0.04)-2.5/(x-0.04) = 0
50*(x-0.04)-2.5 = 0
50*x-4.5 = 0
(50*x-4.5)/(x-0.04) = 0
(50*x-4.5)/(x-0.04) = 0 // * x-0.04
50*x-4.5 = 0
50*x-4.5 = 0 // + 4.5
50*x = 4.5 // : 50
x = 4.5/50
x = 0.09
x = 0.09
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