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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3/11 = 27/z // - 27/z
3/11-(27/z) = 0
3/11-27*z^-1 = 0
-27*z^-1 = -3/11 // : -27
z^-1 = 1/99
-1 < 0
1/(z^1) = 1/99 // * z^1
1 = 1/99*z^1 // : 1/99
99 = z^1
z = 99
z = 99
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