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