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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
10/7 = 8/k // - 8/k
10/7-(8/k) = 0
10/7-8*k^-1 = 0
-8*k^-1 = -10/7 // : -8
k^-1 = 5/28
-1 < 0
1/(k^1) = 5/28 // * k^1
1 = 5/28*k^1 // : 5/28
28/5 = k^1
k = 28/5
k = 28/5
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