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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3/11 = 18/z // - 18/z
3/11-(18/z) = 0
3/11-18*z^-1 = 0
-18*z^-1 = -3/11 // : -18
z^-1 = 1/66
-1 < 0
1/(z^1) = 1/66 // * z^1
1 = 1/66*z^1 // : 1/66
66 = z^1
z = 66
z = 66
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