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D( i )
8*i+7 = 0
8*i+7 = 0
8*i+7 = 0
8*i+7 = 0 // - 7
8*i = -7 // : 8
i = -7/8
i in (-oo:-7/8) U (-7/8:+oo)
(3*i+9)/(8*i+7) = 0
3*i+9 = 0 // - 9
3*i = -9 // : 3
i = -9/3
i = -3
i = -3
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