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