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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3.06/z = 5.1/64 // - 5.1/64
3.06/z-(5.1/64) = 0
3.06/z-0.0796875 = 0
3.06*z^-1 = 0.0796875 // : 3.06
z^-1 = 0.02604167
-1 < 0
1/(z^1) = 0.02604167 // * z^1
1 = 0.02604167*z^1 // : 0.02604167
38.39999508 = z^1
z = 38.39999508
z = 38.39999508
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