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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
12/k = 24/k // - 24/k
12/k-(24/k) = 0
12/k-24*k^-1 = 0
-12*k^-1 = 0 // : -12
k^-1 = 0
k naleu017Cy do O
k belongs to the empty set
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