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D( i )
-(6*i)-2 = 0
-(6*i)-2 = 0
-(6*i)-2 = 0
-6*i-2 = 0
-6*i-2 = 0 // + 2
-6*i = 2 // : -6
i = 2/(-6)
i = -1/3
i in (-oo:-1/3) U (-1/3:+oo)
(5*i)/(-(6*i)-2) = 0
(5*i)/(-6*i-2) = 0
5*i = 0 // : 5
i = 0
i = 0
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