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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(2*z)/z+7 = 24/54 // - 24/54
(2*z)/z-(24/54)+7 = 0
(2*z)/z-4/9+7 = 0
77/9 = 0
z belongs to the empty set
z belongs to the empty set
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