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D( i )
5-(11*i) = 0
5-(11*i) = 0
5-(11*i) = 0
5-11*i = 0
5-11*i = 0 // - 5
-11*i = -5 // : -11
i = -5/(-11)
i = 5/11
i in (-oo:5/11) U (5/11:+oo)
7/(5-(11*i)) = 0
7/(5-11*i) = 0
i belongs to the empty set
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