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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/k = 45/18 // - 45/18
2/k-(45/18) = 0
2/k-5/2 = 0
2*k^-1 = 5/2 // : 2
k^-1 = 5/4
-1 < 0
1/(k^1) = 5/4 // * k^1
1 = 5/4*k^1 // : 5/4
4/5 = k^1
k = 4/5
k = 4/5
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