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D( i )
3-i = 0
3-i = 0
3-i = 0
3-i = 0 // - 3
-i = -3 // * -1
i = 3
i in (-oo:3) U (3:+oo)
(5*i)/(3-i) = 0
5*i = 0 // : 5
i = 0
i = 0
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