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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3 = 6/z+8 // - 6/z+8
3-(6/z)-8 = 0
3-6*z^-1-8 = 0
-6*z^-1 = 5 // : -6
z^-1 = -5/6
-1 < 0
1/(z^1) = -5/6 // * z^1
1 = -5/6*z^1 // : -5/6
-6/5 = z^1
z = -6/5
z = -6/5
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