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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/k = 4/7 // - 4/7
5/k-(4/7) = 0
5/k-4/7 = 0
5*k^-1 = 4/7 // : 5
k^-1 = 4/35
-1 < 0
1/(k^1) = 4/35 // * k^1
1 = 4/35*k^1 // : 4/35
35/4 = k^1
k = 35/4
k = 35/4
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