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D( z )
3*z-4 = 0
(1/2)*z = 0
3*z-4 = 0
3*z-4 = 0
3*z-4 = 0 // + 4
3*z = 4 // : 3
z = 4/3
(1/2)*z = 0
(1/2)*z = 0
1/2*z = 0 // : 1/2
z = 0
z in (-oo:0) U (0:4/3) U (4/3:+oo)
5/(3*z-4) = -3/((1/2)*z) // + -3/((1/2)*z)
5/(3*z-4)-(-3/((1/2)*z)) = 0
5/(3*z-4)+6*z^-1 = 0
5/(3*z-4)+6/z = 0
(5*z)/(z*(3*z-4))+(6*(3*z-4))/(z*(3*z-4)) = 0
6*(3*z-4)+5*z = 0
23*z-24 = 0
(23*z-24)/(z*(3*z-4)) = 0
(23*z-24)/(z*(3*z-4)) = 0 // * z*(3*z-4)
23*z-24 = 0
23*z-24 = 0 // + 24
23*z = 24 // : 23
z = 24/23
z = 24/23
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