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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2640/k = 11 // - 11
2640/k-11 = 0
2640*k^-1 = 11 // : 2640
k^-1 = 1/240
-1 < 0
1/(k^1) = 1/240 // * k^1
1 = 1/240*k^1 // : 1/240
240 = k^1
k = 240
k = 240
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