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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
10/k = 12/5 // - 12/5
10/k-(12/5) = 0
10/k-12/5 = 0
10*k^-1 = 12/5 // : 10
k^-1 = 6/25
-1 < 0
1/(k^1) = 6/25 // * k^1
1 = 6/25*k^1 // : 6/25
25/6 = k^1
k = 25/6
k = 25/6
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