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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
2/k = -11/22 // + -11/22
2/k-(-11/22) = 0
2/k+1/2 = 0
2*k^-1 = -1/2 // : 2
k^-1 = -1/4
-1 < 0
1/(k^1) = -1/4 // * k^1
1 = -1/4*k^1 // : -1/4
-4 = k^1
k = -4
k = -4
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