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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.13 = (x-62.68)/x // - (x-62.68)/x
0.13-((x-62.68)/x) = 0
(-1*(x-62.68))/x+0.13 = 0
(-1*(x-62.68))/x+(0.13*x)/x = 0
0.13*x-1*(x-62.68) = 0
62.68-0.87*x = 0
(62.68-0.87*x)/x = 0
(62.68-0.87*x)/x = 0 // * x
62.68-0.87*x = 0
62.68-0.87*x = 0 // - 62.68
-0.87*x = -62.68 // : -0.87
x = -62.68/(-0.87)
x = 72.04597701
x = 72.04597701
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