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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/9 = 10/k-2 // - 10/k-2
5/9-(10/k)+2 = 0
5/9-10*k^-1+2 = 0
-10*k^-1 = -23/9 // : -10
k^-1 = 23/90
-1 < 0
1/(k^1) = 23/90 // * k^1
1 = 23/90*k^1 // : 23/90
90/23 = k^1
k = 90/23
k = 90/23
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