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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
-3/z = 6 // - 6
-3/z-6 = 0
-3*z^-1 = 6 // : -3
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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