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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9 = 54/k // - 54/k
9-(54/k) = 0
9-54*k^-1 = 0
-54*k^-1 = -9 // : -54
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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