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k in (-oo:+oo)
(8/3)*k-(1/3)+1 = 6 // - 6
(8/3)*k-(1/3)-6+1 = 0
(8/3)*k-1/3-6+1 = 0
8/3*k-16/3 = 0 // + 16/3
8/3*k = 16/3 // : 8/3
k = 16/3/8/3
k = 2
k = 2
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