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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/5 = 2/k // - 2/k
3/5-(2/k) = 0
3/5-2*k^-1 = 0
-2*k^-1 = -3/5 // : -2
k^-1 = 3/10
-1 < 0
1/(k^1) = 3/10 // * k^1
1 = 3/10*k^1 // : 3/10
10/3 = k^1
k = 10/3
k = 10/3
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