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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/k-2 = 6/2 // - 6/2
3/k-(6/2)-2 = 0
3/k-3-2 = 0
3*k^-1 = 5 // : 3
k^-1 = 5/3
-1 < 0
1/(k^1) = 5/3 // * k^1
1 = 5/3*k^1 // : 5/3
3/5 = k^1
k = 3/5
k = 3/5
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