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