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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
18/k = 6/95 // - 6/95
18/k-(6/95) = 0
18/k-6/95 = 0
18*k^-1 = 6/95 // : 18
k^-1 = 1/285
-1 < 0
1/(k^1) = 1/285 // * k^1
1 = 1/285*k^1 // : 1/285
285 = k^1
k = 285
k = 285
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