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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
15/k = 15/20 // - 15/20
15/k-(15/20) = 0
15/k-3/4 = 0
15*k^-1 = 3/4 // : 15
k^-1 = 1/20
-1 < 0
1/(k^1) = 1/20 // * k^1
1 = 1/20*k^1 // : 1/20
20 = k^1
k = 20
k = 20
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