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D( i )
5*i-2 = 0
5*i-2 = 0
5*i-2 = 0
5*i-2 = 0 // + 2
5*i = 2 // : 5
i = 2/5
i in (-oo:2/5) U (2/5:+oo)
(-(6*i)-6)/(5*i-2) = 0
(-6*i-6)/(5*i-2) = 0
-6*i-6 = 0 // + 6
-6*i = 6 // : -6
i = 6/(-6)
i = -1
i = -1
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