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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
11/6 = 55/k // - 55/k
11/6-(55/k) = 0
11/6-55*k^-1 = 0
-55*k^-1 = -11/6 // : -55
k^-1 = 1/30
-1 < 0
1/(k^1) = 1/30 // * k^1
1 = 1/30*k^1 // : 1/30
30 = k^1
k = 30
k = 30
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