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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2/z+(5*z)/z-5-1 = 3 // - 3
2/z+(5*z)/z-5-3-1 = 0
2*z^-1 = 4 // : 2
z^-1 = 2
-1 < 0
1/(z^1) = 2 // * z^1
1 = 2*z^1 // : 2
1/2 = z^1
z = 1/2
z = 1/2
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