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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
6/z = -2 // + 2
6/z+2 = 0
6*z^-1 = -2 // : 6
z^-1 = -1/3
-1 < 0
1/(z^1) = -1/3 // * z^1
1 = -1/3*z^1 // : -1/3
-3 = z^1
z = -3
z = -3
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