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D( i )
7-i = 0
7-i = 0
7-i = 0
7-i = 0 // - 7
-i = -7 // * -1
i = 7
i in (-oo:7) U (7:+oo)
(4-(3*i))/(7-i) = 0
(4-3*i)/(7-i) = 0
4-3*i = 0 // - 4
-3*i = -4 // : -3
i = -4/(-3)
i = 4/3
i = 4/3
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