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