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D( i )
9*i+5 = 0
9*i+5 = 0
9*i+5 = 0
9*i+5 = 0 // - 5
9*i = -5 // : 9
i = -5/9
i in (-oo:-5/9) U (-5/9:+oo)
(2*i+3)/(9*i+5) = 0
2*i+3 = 0 // - 3
2*i = -3 // : 2
i = -3/2
i = -3/2
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