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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
17 = 5/k-2 // - 5/k-2
2-(5/k)+17 = 0
2-5*k^-1+17 = 0
-5*k^-1 = -19 // : -5
k^-1 = 19/5
-1 < 0
1/(k^1) = 19/5 // * k^1
1 = 19/5*k^1 // : 19/5
5/19 = k^1
k = 5/19
k = 5/19
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