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