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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
121/16.5 = 22/z // - 22/z
121/16.5-(22/z) = 0
121/16.5-22*z^-1 = 0
-22*z^-1 = -7.33333333 // : -22
z^-1 = 0.33333333
-1 < 0
1/(z^1) = 0.33333333 // * z^1
1 = 0.33333333*z^1 // : 0.33333333
3.00000003 = z^1
z = 3.00000003
z = 3.00000003
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