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k in (-oo:+oo)
6*k-(1/6) = 4*k+131/6 // - 4*k+131/6
6*k-(4*k)-(1/6)-(131/6) = 0
6*k-4*k-1/6-131/6 = 0
2*k-22 = 0 // + 22
2*k = 22 // : 2
k = 22/2
k = 11
k = 11
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