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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
126/k = 14/3 // - 14/3
126/k-(14/3) = 0
126/k-14/3 = 0
126*k^-1 = 14/3 // : 126
k^-1 = 1/27
-1 < 0
1/(k^1) = 1/27 // * k^1
1 = 1/27*k^1 // : 1/27
27 = k^1
k = 27
k = 27
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