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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/k = 3/15 // - 3/15
2/k-(3/15) = 0
2/k-1/5 = 0
2*k^-1 = 1/5 // : 2
k^-1 = 1/10
-1 < 0
1/(k^1) = 1/10 // * k^1
1 = 1/10*k^1 // : 1/10
10 = k^1
k = 10
k = 10
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