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D( i )
2-(4*i) = 0
2-(4*i) = 0
2-(4*i) = 0
2-4*i = 0
2-4*i = 0 // - 2
-4*i = -2 // : -4
i = -2/(-4)
i = 1/2
i in (-oo:1/2) U (1/2:+oo)
1.5/(2-(4*i)) = 0
1.5/(2-4*i) = 0
1.5 = 0
i belongs to the empty set
i belongs to the empty set
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