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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
8-(8/z) = 3 // - 3
8-(8/z)-3 = 0
8-8*z^-1-3 = 0
-8*z^-1 = -5 // : -8
z^-1 = 5/8
-1 < 0
1/(z^1) = 5/8 // * z^1
1 = 5/8*z^1 // : 5/8
8/5 = z^1
z = 8/5
z = 8/5
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