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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
17/z-1 = 8 // - 8
17/z-8-1 = 0
17*z^-1 = 9 // : 17
z^-1 = 9/17
-1 < 0
1/(z^1) = 9/17 // * z^1
1 = 9/17*z^1 // : 9/17
17/9 = z^1
z = 17/9
z = 17/9
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