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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/k-6 = 0
5*k^-1 = 6 // : 5
k^-1 = 6/5
-1 < 0
1/(k^1) = 6/5 // * k^1
1 = 6/5*k^1 // : 6/5
5/6 = k^1
k = 5/6
k = 5/6
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