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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
191403/x = 0.4 // - 0.4
191403/x-0.4 = 0
191403*x^-1 = 0.4 // : 191403
x^-1 = 0.00000209
-1 < 0
1/(x^1) = 0.00000209 // * x^1
1 = 0.00000209*x^1 // : 0.00000209
478468.89952153 = x^1
x = 478468.89952153
x = 478468.89952153
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