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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/k = 9/39 // - 9/39
3/k-(9/39) = 0
3/k-3/13 = 0
3*k^-1 = 3/13 // : 3
k^-1 = 1/13
-1 < 0
1/(k^1) = 1/13 // * k^1
1 = 1/13*k^1 // : 1/13
13 = k^1
k = 13
k = 13
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