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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
81/z-10 = 1 // - 1
81/z-10-1 = 0
81*z^-1 = 11 // : 81
z^-1 = 11/81
-1 < 0
1/(z^1) = 11/81 // * z^1
1 = 11/81*z^1 // : 11/81
81/11 = z^1
z = 81/11
z = 81/11
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