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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
8/k = 14/k+3 // - 14/k+3
8/k-(14/k)-3 = 0
8/k-14*k^-1-3 = 0
-6*k^-1 = 3 // : -6
k^-1 = -1/2
-1 < 0
1/(k^1) = -1/2 // * k^1
1 = -1/2*k^1 // : -1/2
-2 = k^1
k = -2
k = -2
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