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D( i )
5*i+6 = 0
5*i+6 = 0
5*i+6 = 0
5*i+6 = 0 // - 6
5*i = -6 // : 5
i = -6/5
i in (-oo:-6/5) U (-6/5:+oo)
(4-(7*i))/(5*i+6) = 0
(4-7*i)/(5*i+6) = 0
4-7*i = 0 // - 4
-7*i = -4 // : -7
i = -4/(-7)
i = 4/7
i = 4/7
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