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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/k = 5/12 // - 5/12
4/k-(5/12) = 0
4/k-5/12 = 0
4*k^-1 = 5/12 // : 4
k^-1 = 5/48
-1 < 0
1/(k^1) = 5/48 // * k^1
1 = 5/48*k^1 // : 5/48
48/5 = k^1
k = 48/5
k = 48/5
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