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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3/k = 4545/18 // - 4545/18
3/k-(4545/18) = 0
3/k-505/2 = 0
3*k^-1 = 505/2 // : 3
k^-1 = 505/6
-1 < 0
1/(k^1) = 505/6 // * k^1
1 = 505/6*k^1 // : 505/6
6/505 = k^1
k = 6/505
k = 6/505
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