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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/17-(3/z) = 0
4/17-3*z^-1 = 0
-3*z^-1 = -4/17 // : -3
z^-1 = 4/51
-1 < 0
1/(z^1) = 4/51 // * z^1
1 = 4/51*z^1 // : 4/51
51/4 = z^1
z = 51/4
z = 51/4
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