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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)
(6*i+2)/(7*i+5) = 0
6*i+2 = 0 // - 2
6*i = -2 // : 6
i = -2/6
i = -1/3
i = -1/3
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