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D( i )
7*i+5 = 0
7*i+5 = 0
7*i+5 = 0
7*i+5 = 0 // - 5
7*i = -5 // : 7
i = -5/7
i in (-oo:-5/7) U (-5/7:+oo)
(4*i+1)/(7*i+5) = 0
4*i+1 = 0 // - 1
4*i = -1 // : 4
i = -1/4
i = -1/4
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