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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/k = 11/3 // - 11/3
4/k-(11/3) = 0
4/k-11/3 = 0
4*k^-1 = 11/3 // : 4
k^-1 = 11/12
-1 < 0
1/(k^1) = 11/12 // * k^1
1 = 11/12*k^1 // : 11/12
12/11 = k^1
k = 12/11
k = 12/11
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