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D( x )
x-0.05 = 0
x-0.05 = 0
x-0.05 = 0
x-0.05 = 0 // + 0.05
x = 0.05
x in (-oo:0.05) U (0.05:+oo)
40 = 4/(x-0.05) // - 4/(x-0.05)
40-(4/(x-0.05)) = 0
40-4*(x-0.05)^-1 = 0
40-4/(x-0.05) = 0
(40*(x-0.05))/(x-0.05)-4/(x-0.05) = 0
40*(x-0.05)-4 = 0
40*x-6 = 0
(40*x-6)/(x-0.05) = 0
(40*x-6)/(x-0.05) = 0 // * x-0.05
40*x-6 = 0
40*x-6 = 0 // + 6
40*x = 6 // : 40
x = 6/40
x = 3/20
x = 3/20
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