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k in (-oo:+oo)
(1/2)*k+6 = 67/11 // - 67/11
(1/2)*k-(67/11)+6 = 0
(1/2)*k-67/11+6 = 0
1/2*k-1/11 = 0 // + 1/11
1/2*k = 1/11 // : 1/2
k = 1/11/1/2
k = 2/11
k = 2/11
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