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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
15/k = 5/4 // - 5/4
15/k-(5/4) = 0
15/k-5/4 = 0
15*k^-1 = 5/4 // : 15
k^-1 = 1/12
-1 < 0
1/(k^1) = 1/12 // * k^1
1 = 1/12*k^1 // : 1/12
12 = k^1
k = 12
k = 12
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