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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
8/11 = 6/z // - 6/z
8/11-(6/z) = 0
8/11-6*z^-1 = 0
-6*z^-1 = -8/11 // : -6
z^-1 = 4/33
-1 < 0
1/(z^1) = 4/33 // * z^1
1 = 4/33*z^1 // : 4/33
33/4 = z^1
z = 33/4
z = 33/4
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