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