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D( i )
3-(12*i) = 0
3-(12*i) = 0
3-(12*i) = 0
3-12*i = 0
3-12*i = 0 // - 3
-12*i = -3 // : -12
i = -3/(-12)
i = 1/4
i in (-oo:1/4) U (1/4:+oo)
6/(3-(12*i)) = 0
6/(3-12*i) = 0
6 = 0
i belongs to the empty set
i belongs to the empty set
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