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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
12/k = 2 // - 2
12/k-2 = 0
12*k^-1 = 2 // : 12
k^-1 = 1/6
-1 < 0
1/(k^1) = 1/6 // * k^1
1 = 1/6*k^1 // : 1/6
6 = k^1
k = 6
k = 6
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