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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
8/k = 2/5 // - 2/5
8/k-(2/5) = 0
8/k-2/5 = 0
8*k^-1 = 2/5 // : 8
k^-1 = 1/20
-1 < 0
1/(k^1) = 1/20 // * k^1
1 = 1/20*k^1 // : 1/20
20 = k^1
k = 20
k = 20
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