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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(25*z+14*z-24)/z+4 = 0
(39*z-24)/z+4 = 0
(39*z-24)/z+(4*z)/z = 0
39*z+4*z-24 = 0
43*z-24 = 0
(43*z-24)/z = 0
(43*z-24)/z = 0 // * z
43*z-24 = 0
43*z-24 = 0 // + 24
43*z = 24 // : 43
z = 24/43
z = 24/43
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