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