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D( i )
5*i+4 = 0
5*i+4 = 0
5*i+4 = 0
5*i+4 = 0 // - 4
5*i = -4 // : 5
i = -4/5
i in (-oo:-4/5) U (-4/5:+oo)
(3*i+2)/(5*i+4) = 0
3*i+2 = 0 // - 2
3*i = -2 // : 3
i = -2/3
i = -2/3
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