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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
28/z = 24/z-5 // - 24/z-5
28/z-(24/z)+5 = 0
28/z-24*z^-1+5 = 0
4*z^-1 = -5 // : 4
z^-1 = -5/4
-1 < 0
1/(z^1) = -5/4 // * z^1
1 = -5/4*z^1 // : -5/4
-4/5 = z^1
z = -4/5
z = -4/5
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