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k in (-oo:+oo)
4*k-(2*k)-1 = 11 // - 11
4*k-(2*k)-11-1 = 0
4*k-2*k-11-1 = 0
2*k-12 = 0 // + 12
2*k = 12 // : 2
k = 12/2
k = 6
k = 6
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