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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)
abs((3*z-1)/(z-3)) = 1 // - 1
abs((3*z-1)/(z-3))-1 = 0
abs((3*z-1)/(z-3))-1 = 0
z in (-oo:+oo)
abs((3*z-1)/(z-3))
(3*z-1)/(z-3) >= 0
( 3*z-1 )
3*z-1 >= 0 // + 1
3*z >= 1 // : 3
z >= 1/3
( z-3 )
z-3 >= 0 // + 3
z >= 3
(-oo:1/3)(1/3:3)(3:+oo)3*z-1-++z-3--+
z in (-oo:1/3> U <3:+oo)
(3*z-1)/(z-3)-1 = 0
z in (1/3:3)
-((3*z-1)/(z-3))-1 = 0
abs((3*z-1)/(z-3))-1 = 0
/| (3*z-1)/(z-3)-1 = 0 i z in (-oo:1/3> U <3:+oo)| -((3*z-1)/(z-3))-1 = 0 i z in (1/3:3)
z in (-oo:1/3> U <3:+oo)
(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 in (1/3:3)
-((3*z-1)/(z-3))-1 = 0
(-1*(3*z-1))/(z-3)-1 = 0
(-1*(3*z-1))/(z-3)+(-1*(z-3))/(z-3) = 0
-1*(3*z-1)-1*(z-3) = 0
4-4*z = 0
(4-4*z)/(z-3) = 0
(4-4*z)/(z-3) = 0 // * z-3
4-4*z = 0
4-4*z = 0 // - 4
-4*z = -4 // : -4
z = -4/(-4)
z = 1
z in { -1, 1 }
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