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D( z )
3*z-8 = 0
3*z-8 = 0
3*z-8 = 0
3*z-8 = 0 // + 8
3*z = 8 // : 3
z = 8/3
z in (-oo:8/3) U (8/3:+oo)
(z-3)/(3*z-8) = 0
z-3 = 0 // + 3
z = 3
z = 3
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