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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3-11 = -9/z // + -9/z
3-(-9/z)-11 = 0
9*z^-1-11+3 = 0
9*z^-1 = 8 // : 9
z^-1 = 8/9
-1 < 0
1/(z^1) = 8/9 // * z^1
1 = 8/9*z^1 // : 8/9
9/8 = z^1
z = 9/8
z = 9/8
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