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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2 = 2/3-(5/z) // - 2/3-(5/z)
5/z-(2/3)+2 = 0
5/z-2/3+2 = 0
5*z^-1 = -4/3 // : 5
z^-1 = -4/15
-1 < 0
1/(z^1) = -4/15 // * z^1
1 = -4/15*z^1 // : -4/15
-15/4 = z^1
z = -15/4
z = -15/4
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