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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
8/7 = 11/z // - 11/z
8/7-(11/z) = 0
8/7-11*z^-1 = 0
-11*z^-1 = -8/7 // : -11
z^-1 = 8/77
-1 < 0
1/(z^1) = 8/77 // * z^1
1 = 8/77*z^1 // : 8/77
77/8 = z^1
z = 77/8
z = 77/8
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