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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
6/k = 7/2 // - 7/2
6/k-(7/2) = 0
6/k-7/2 = 0
6*k^-1 = 7/2 // : 6
k^-1 = 7/12
-1 < 0
1/(k^1) = 7/12 // * k^1
1 = 7/12*k^1 // : 7/12
12/7 = k^1
k = 12/7
k = 12/7
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