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D( i )
3*i+5 = 0
3*i+5 = 0
3*i+5 = 0
3*i+5 = 0 // - 5
3*i = -5 // : 3
i = -5/3
i in (-oo:-5/3) U (-5/3:+oo)
(3*i+7)/(3*i+5) = 0
3*i+7 = 0 // - 7
3*i = -7 // : 3
i = -7/3
i = -7/3
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