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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = 0.02/x // - 0.02/x
10-(0.02/x) = 0
10-0.02*x^-1 = 0
-0.02*x^-1 = -10 // : -0.02
x^-1 = 500
-1 < 0
1/(x^1) = 500 // * x^1
1 = 500*x^1 // : 500
1/500 = x^1
x = 1/500
x = 1/500
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