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