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D( i )
4*i+5 = 0
4*i+5 = 0
4*i+5 = 0
4*i+5 = 0 // - 5
4*i = -5 // : 4
i = -5/4
i in (-oo:-5/4) U (-5/4:+oo)
(4*i+4)/(4*i+5) = 0
4*i+4 = 0 // - 4
4*i = -4 // : 4
i = -4/4
i = -1
i = -1
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