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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/z = 7/3 // - 7/3
4/z-(7/3) = 0
4/z-7/3 = 0
4*z^-1 = 7/3 // : 4
z^-1 = 7/12
-1 < 0
1/(z^1) = 7/12 // * z^1
1 = 7/12*z^1 // : 7/12
12/7 = z^1
z = 12/7
z = 12/7
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