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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
52/k = 13/3 // - 13/3
52/k-(13/3) = 0
52/k-13/3 = 0
52*k^-1 = 13/3 // : 52
k^-1 = 1/12
-1 < 0
1/(k^1) = 1/12 // * k^1
1 = 1/12*k^1 // : 1/12
12 = k^1
k = 12
k = 12
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