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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9-(6/k) = 2 // - 2
9-(6/k)-2 = 0
9-6*k^-1-2 = 0
-6*k^-1 = -7 // : -6
k^-1 = 7/6
-1 < 0
1/(k^1) = 7/6 // * k^1
1 = 7/6*k^1 // : 7/6
6/7 = k^1
k = 6/7
k = 6/7
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