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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
20/k = 10 // - 10
20/k-10 = 0
20*k^-1 = 10 // : 20
k^-1 = 1/2
-1 < 0
1/(k^1) = 1/2 // * k^1
1 = 1/2*k^1 // : 1/2
2 = k^1
k = 2
k = 2
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