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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.6 = 0.03/x // - 0.03/x
0.6-(0.03/x) = 0
0.6-0.03*x^-1 = 0
-0.03*x^-1 = -0.6 // : -0.03
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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