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D( i )
2-(3*i) = 0
2-(3*i) = 0
2-(3*i) = 0
2-3*i = 0
2-3*i = 0 // - 2
-3*i = -2 // : -3
i = -2/(-3)
i = 2/3
i in (-oo:2/3) U (2/3:+oo)
4/(2-(3*i)) = 0
4/(2-3*i) = 0
4 = 0
i belongs to the empty set
i belongs to the empty set
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