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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
5/18 = 10/z-(1/18) // - 10/z-(1/18)
5/18-(10/z)+1/18 = 0
5/18-10*z^-1+1/18 = 0
-10*z^-1 = -1/3 // : -10
z^-1 = 1/30
-1 < 0
1/(z^1) = 1/30 // * z^1
1 = 1/30*z^1 // : 1/30
30 = z^1
z = 30
z = 30
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