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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
20 = 5/k // - 5/k
20-(5/k) = 0
20-5*k^-1 = 0
-5*k^-1 = -20 // : -5
k^-1 = 4
-1 < 0
1/(k^1) = 4 // * k^1
1 = 4*k^1 // : 4
1/4 = k^1
k = 1/4
k = 1/4
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