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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
(4-(6*i))/i = 0
(4-6*i)/i = 0
4-6*i = 0 // - 4
-6*i = -4 // : -6
i = -4/(-6)
i = 2/3
i = 2/3
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