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D( i )
2*i+5 = 0
2*i+5 = 0
2*i+5 = 0
2*i+5 = 0 // - 5
2*i = -5 // : 2
i = -5/2
i in (-oo:-5/2) U (-5/2:+oo)
(9*i+8)/(2*i+5) = 0
9*i+8 = 0 // - 8
9*i = -8 // : 9
i = -8/9
i = -8/9
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