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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/10 = 26/z // - 26/z
4/10-(26/z) = 0
4/10-26*z^-1 = 0
-26*z^-1 = -2/5 // : -26
z^-1 = 1/65
-1 < 0
1/(z^1) = 1/65 // * z^1
1 = 1/65*z^1 // : 1/65
65 = z^1
z = 65
z = 65
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