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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)
2.8035/(x-0.05) = 80 // - 80
2.8035/(x-0.05)-80 = 0
2.8035/(x-0.05)+(-80*(x-0.05))/(x-0.05) = 0
2.8035-80*(x-0.05) = 0
6.8035-80*x = 0
(6.8035-80*x)/(x-0.05) = 0
(6.8035-80*x)/(x-0.05) = 0 // * x-0.05
6.8035-80*x = 0
6.8035-80*x = 0 // - 6.8035
-80*x = -6.8035 // : -80
x = -6.8035/(-80)
x = 0.08504375
x = 0.08504375
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