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