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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(3/5)/k = 2.5 // - 2.5
(3/5)/k-2.5 = 0
3/5*k^-1 = 2.5 // : 3/5
k^-1 = 4.16666667
-1 < 0
1/(k^1) = 4.16666667 // * k^1
1 = 4.16666667*k^1 // : 4.16666667
0.24 = k^1
k = 0.24
k = 0.24
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