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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
-33.04 = -0.03/z // + -0.03/z
-(-0.03/z)-33.04 = 0
0.03*z^-1-33.04 = 0
0.03*z^-1 = 33.04 // : 0.03
z^-1 = 1101.33333333
-1 < 0
1/(z^1) = 1101.33333333 // * z^1
1 = 1101.33333333*z^1 // : 1101.33333333
0.00090799 = z^1
z = 0.00090799
z = 0.00090799
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