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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
6/10.8 = 10/k // - 10/k
6/10.8-(10/k) = 0
6/10.8-10*k^-1 = 0
-10*k^-1 = -0.55555556 // : -10
k^-1 = 0.05555556
-1 < 0
1/(k^1) = 0.05555556 // * k^1
1 = 0.05555556*k^1 // : 0.05555556
17.99999856 = k^1
k = 17.99999856
k = 17.99999856
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