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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
6 = 9/k // - 9/k
6-(9/k) = 0
6-9*k^-1 = 0
-9*k^-1 = -6 // : -9
k^-1 = 2/3
-1 < 0
1/(k^1) = 2/3 // * k^1
1 = 2/3*k^1 // : 2/3
3/2 = k^1
k = 3/2
k = 3/2
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