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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4002/k = 46 // - 46
4002/k-46 = 0
4002*k^-1 = 46 // : 4002
k^-1 = 1/87
-1 < 0
1/(k^1) = 1/87 // * k^1
1 = 1/87*k^1 // : 1/87
87 = k^1
k = 87
k = 87
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