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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/8 = 5/k-8 // - 5/k-8
2/8-(5/k)+8 = 0
2/8-5*k^-1+8 = 0
-5*k^-1 = -33/4 // : -5
k^-1 = 33/20
-1 < 0
1/(k^1) = 33/20 // * k^1
1 = 33/20*k^1 // : 33/20
20/33 = k^1
k = 20/33
k = 20/33
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