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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/k-6 = 0
4*k^-1 = 6 // : 4
k^-1 = 3/2
-1 < 0
1/(k^1) = 3/2 // * k^1
1 = 3/2*k^1 // : 3/2
2/3 = k^1
k = 2/3
k = 2/3
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