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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
6/z = -30 // + 30
6/z+30 = 0
6*z^-1 = -30 // : 6
z^-1 = -5
-1 < 0
1/(z^1) = -5 // * z^1
1 = -5*z^1 // : -5
-1/5 = z^1
z = -1/5
z = -1/5
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