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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(z/2)/z-4 = 10/12 // - 10/12
(z/2)/z-(10/12)-4 = 0
(z/2)/z-5/6-4 = 0
-13/3 = 0
z belongs to the empty set
z belongs to the empty set
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