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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/k+6 = 10/9 // - 10/9
5/k-(10/9)+6 = 0
5/k-10/9+6 = 0
5*k^-1 = -44/9 // : 5
k^-1 = -44/45
-1 < 0
1/(k^1) = -44/45 // * k^1
1 = -44/45*k^1 // : -44/45
-45/44 = k^1
k = -45/44
k = -45/44
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