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k in (-oo:+oo)
2*k-(1/3) = 9 // - 9
2*k-(1/3)-9 = 0
2*k-1/3-9 = 0
2*k-28/3 = 0 // + 28/3
2*k = 28/3 // : 2
k = 28/3/2
k = 14/3
k = 14/3
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