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D( i )
5-(8*i) = 0
5-(8*i) = 0
5-(8*i) = 0
5-8*i = 0
5-8*i = 0 // - 5
-8*i = -5 // : -8
i = -5/(-8)
i = 5/8
i in (-oo:5/8) U (5/8:+oo)
(9-(3*i))/(5-(8*i)) = 0
(9-3*i)/(5-8*i) = 0
9-3*i = 0 // - 9
-3*i = -9 // : -3
i = -9/(-3)
i = 3
i = 3
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