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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
6/k-11 = 2/7 // - 2/7
6/k-(2/7)-11 = 0
6/k-2/7-11 = 0
6*k^-1 = 79/7 // : 6
k^-1 = 79/42
-1 < 0
1/(k^1) = 79/42 // * k^1
1 = 79/42*k^1 // : 79/42
42/79 = k^1
k = 42/79
k = 42/79
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