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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.002/x = 0.04 // - 0.04
0.002/x-0.04 = 0
0.002*x^-1 = 0.04 // : 0.002
x^-1 = 20
-1 < 0
1/(x^1) = 20 // * x^1
1 = 20*x^1 // : 20
1/20 = x^1
x = 1/20
x = 1/20
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