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D( i )
8*i-5 = 0
8*i-5 = 0
8*i-5 = 0
8*i-5 = 0 // + 5
8*i = 5 // : 8
i = 5/8
i in (-oo:5/8) U (5/8:+oo)
(3*i-10)/(8*i-5) = 0
3*i-10 = 0 // + 10
3*i = 10 // : 3
i = 10/3
i = 10/3
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