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D( i )
7*i+8 = 0
7*i+8 = 0
7*i+8 = 0
7*i+8 = 0 // - 8
7*i = -8 // : 7
i = -8/7
i in (-oo:-8/7) U (-8/7:+oo)
(6*i+4)/(7*i+8) = 0
6*i+4 = 0 // - 4
6*i = -4 // : 6
i = -4/6
i = -2/3
i = -2/3
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