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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.6 = 1-(1/x) // - 1-(1/x)
1/x-1+0.6 = 0
1*x^-1 = 0.4 // : 1
x^-1 = 0.4
-1 < 0
1/(x^1) = 0.4 // * x^1
1 = 0.4*x^1 // : 0.4
2.5 = x^1
x = 2.5
x = 2.5
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