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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/k-9 = 4 // - 4
3/k-9-4 = 0
3*k^-1 = 13 // : 3
k^-1 = 13/3
-1 < 0
1/(k^1) = 13/3 // * k^1
1 = 13/3*k^1 // : 13/3
3/13 = k^1
k = 3/13
k = 3/13
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