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D( i )
5-(6*i) = 0
5-(6*i) = 0
5-(6*i) = 0
5-6*i = 0
5-6*i = 0 // - 5
-6*i = -5 // : -6
i = -5/(-6)
i = 5/6
i in (-oo:5/6) U (5/6:+oo)
(7*i)/(5-(6*i)) = 0
(7*i)/(5-6*i) = 0
7*i = 0 // : 7
i = 0
i = 0
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