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k in (-oo:+oo)
1-(2*k) = -5/11 // + -5/11
1-(2*k)-(-5/11) = 0
5/11-2*k+1 = 0
16/11-2*k = 0 // - 16/11
-2*k = -16/11 // : -2
k = -16/11/(-2)
k = 8/11
k = 8/11
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