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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
10/k-(14/k)-(10/3) = 1 // - 1
10/k-(14/k)-(10/3)-1 = 0
10/k-14*k^-1-10/3-1 = 0
-4*k^-1 = 13/3 // : -4
k^-1 = -13/12
-1 < 0
1/(k^1) = -13/12 // * k^1
1 = -13/12*k^1 // : -13/12
-12/13 = k^1
k = -12/13
k = -12/13
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