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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
25/35 = 10/k // - 10/k
25/35-(10/k) = 0
25/35-10*k^-1 = 0
-10*k^-1 = -5/7 // : -10
k^-1 = 1/14
-1 < 0
1/(k^1) = 1/14 // * k^1
1 = 1/14*k^1 // : 1/14
14 = k^1
k = 14
k = 14
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