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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
120/z = 24 // - 24
120/z-24 = 0
120*z^-1 = 24 // : 120
z^-1 = 1/5
-1 < 0
1/(z^1) = 1/5 // * z^1
1 = 1/5*z^1 // : 1/5
5 = z^1
z = 5
z = 5
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