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D( i )
2-i = 0
2-i = 0
2-i = 0
2-i = 0 // - 2
-i = -2 // * -1
i = 2
i in (-oo:2) U (2:+oo)
(5*i)/(2-i) = 0
5*i = 0 // : 5
i = 0
i = 0
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