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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.13 = (62.68-x)/x // - (62.68-x)/x
0.13-((62.68-x)/x) = 0
(-1*(62.68-x))/x+0.13 = 0
(-1*(62.68-x))/x+(0.13*x)/x = 0
0.13*x-1*(62.68-x) = 0
1.13*x-62.68 = 0
(1.13*x-62.68)/x = 0
(1.13*x-62.68)/x = 0 // * x
1.13*x-62.68 = 0
1.13*x-62.68 = 0 // + 62.68
1.13*x = 62.68 // : 1.13
x = 62.68/1.13
x = 55.46902655
x = 55.46902655
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