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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
12/11 = 8/k // - 8/k
12/11-(8/k) = 0
12/11-8*k^-1 = 0
-8*k^-1 = -12/11 // : -8
k^-1 = 3/22
-1 < 0
1/(k^1) = 3/22 // * k^1
1 = 3/22*k^1 // : 3/22
22/3 = k^1
k = 22/3
k = 22/3
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