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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/9 = 6/k // - 6/k
2/9-(6/k) = 0
2/9-6*k^-1 = 0
-6*k^-1 = -2/9 // : -6
k^-1 = 1/27
-1 < 0
1/(k^1) = 1/27 // * k^1
1 = 1/27*k^1 // : 1/27
27 = k^1
k = 27
k = 27
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