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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/k = 10/9 // - 10/9
3/k-(10/9) = 0
3/k-10/9 = 0
3*k^-1 = 10/9 // : 3
k^-1 = 10/27
-1 < 0
1/(k^1) = 10/27 // * k^1
1 = 10/27*k^1 // : 10/27
27/10 = k^1
k = 27/10
k = 27/10
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