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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/k = -2/3 // + -2/3
4/k-(-2/3) = 0
4/k+2/3 = 0
4*k^-1 = -2/3 // : 4
k^-1 = -1/6
-1 < 0
1/(k^1) = -1/6 // * k^1
1 = -1/6*k^1 // : -1/6
-6 = k^1
k = -6
k = -6
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