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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
-6/k = 3/4 // - 3/4
-6/k-(3/4) = 0
-6/k-3/4 = 0
-6*k^-1 = 3/4 // : -6
k^-1 = -1/8
-1 < 0
1/(k^1) = -1/8 // * k^1
1 = -1/8*k^1 // : -1/8
-8 = k^1
k = -8
k = -8
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