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D( i )
9-(5*i) = 0
9-(5*i) = 0
9-(5*i) = 0
9-5*i = 0
9-5*i = 0 // - 9
-5*i = -9 // : -5
i = -9/(-5)
i = 9/5
i in (-oo:9/5) U (9/5:+oo)
7/(9-(5*i)) = 0
7/(9-5*i) = 0
7 = 0
i belongs to the empty set
i belongs to the empty set
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