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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2/5 = 372/z // - 372/z
2/5-(372/z) = 0
2/5-372*z^-1 = 0
-372*z^-1 = -2/5 // : -372
z^-1 = 1/930
-1 < 0
1/(z^1) = 1/930 // * z^1
1 = 1/930*z^1 // : 1/930
930 = z^1
z = 930
z = 930
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