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