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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
5/z-(3/4)-6 = z/z-6 // - z/z-6
5/z-(z/z)-(3/4)-6+6 = 0
5/z-3/4-6-1+6 = 0
5*z^-1 = 7/4 // : 5
z^-1 = 7/20
-1 < 0
1/(z^1) = 7/20 // * z^1
1 = 7/20*z^1 // : 7/20
20/7 = z^1
z = 20/7
z = 20/7
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