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D( i )
i+4 = 0
i+4 = 0
i+4 = 0
i+4 = 0 // - 4
i = -4
i in (-oo:-4) U (-4:+oo)
(10-(3*i))/(i+4) = 0
(10-3*i)/(i+4) = 0
10-3*i = 0 // - 10
-3*i = -10 // : -3
i = -10/(-3)
i = 10/3
i = 10/3
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