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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.0185 = 2000/x // - 2000/x
0.0185-(2000/x) = 0
0.0185-2000*x^-1 = 0
-2000*x^-1 = -0.0185 // : -2000
x^-1 = 0.00000925
-1 < 0
1/(x^1) = 0.00000925 // * x^1
1 = 0.00000925*x^1 // : 0.00000925
108108.10810811 = x^1
x = 108108.10810811
x = 108108.10810811
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