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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/k = 1/8 // - 1/8
2/k-(1/8) = 0
2/k-1/8 = 0
2*k^-1 = 1/8 // : 2
k^-1 = 1/16
-1 < 0
1/(k^1) = 1/16 // * k^1
1 = 1/16*k^1 // : 1/16
16 = k^1
k = 16
k = 16
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