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D( i )
4-i = 0
4-i = 0
4-i = 0
4-i = 0 // - 4
-i = -4 // * -1
i = 4
i in (-oo:4) U (4:+oo)
(4*i)/(4-i) = 0
4*i = 0 // : 4
i = 0
i = 0
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