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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
10/k = 2/7 // - 2/7
10/k-(2/7) = 0
10/k-2/7 = 0
10*k^-1 = 2/7 // : 10
k^-1 = 1/35
-1 < 0
1/(k^1) = 1/35 // * k^1
1 = 1/35*k^1 // : 1/35
35 = k^1
k = 35
k = 35
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