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