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D( i )
8*i-10 = 0
8*i-10 = 0
8*i-10 = 0
8*i-10 = 0 // + 10
8*i = 10 // : 8
i = 10/8
i = 5/4
i in (-oo:5/4) U (5/4:+oo)
(7*i+9)/(8*i-10) = 0
7*i+9 = 0 // - 9
7*i = -9 // : 7
i = -9/7
i = -9/7
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