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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2867 = 100/x // - 100/x
0.2867-(100/x) = 0
0.2867-100*x^-1 = 0
-100*x^-1 = -0.2867 // : -100
x^-1 = 0.002867
-1 < 0
1/(x^1) = 0.002867 // * x^1
1 = 0.002867*x^1 // : 0.002867
348.79665155 = x^1
x = 348.79665155
x = 348.79665155
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