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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(4*z)/z-(2/z)-0.5-0.25 = 0
(4*z)/z-2*z^-1-0.5-0.25 = 0
-2*z^-1 = -3.25 // : -2
z^-1 = 1.625
-1 < 0
1/(z^1) = 1.625 // * z^1
1 = 1.625*z^1 // : 1.625
0.61538462 = z^1
z = 0.61538462
z = 0.61538462
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