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D( i )
8-(6*i) = 0
8-(6*i) = 0
8-(6*i) = 0
8-6*i = 0
8-6*i = 0 // - 8
-6*i = -8 // : -6
i = -8/(-6)
i = 4/3
i in (-oo:4/3) U (4/3:+oo)
(5*i+2)/(8-(6*i)) = 0
(5*i+2)/(8-6*i) = 0
5*i+2 = 0 // - 2
5*i = -2 // : 5
i = -2/5
i = -2/5
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