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D( i )
7*i = 0
7*i = 0
7*i = 0
7*i = 0 // : 7
i = 0
i in (-oo:0) U (0:+oo)
5/(7*i) = 0
5/7*i^-1 = 0 // : 5/7
i^-1 = 0
i naleu017Cy do O
i belongs to the empty set
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