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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)
(4-(5*i))/(4-(6*i)) = 0
(4-5*i)/(4-6*i) = 0
4-5*i = 0 // - 4
-5*i = -4 // : -5
i = -4/(-5)
i = 4/5
i = 4/5
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