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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/k = 20/35 // - 20/35
3/k-(20/35) = 0
3/k-4/7 = 0
3*k^-1 = 4/7 // : 3
k^-1 = 4/21
-1 < 0
1/(k^1) = 4/21 // * k^1
1 = 4/21*k^1 // : 4/21
21/4 = k^1
k = 21/4
k = 21/4
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