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k in (-oo:+oo)
(2*k)/3 = 1/6 // - 1/6
(2*k)/3-(1/6) = 0
(2*k)/3-1/6 = 0
2/3*k-1/6 = 0 // + 1/6
2/3*k = 1/6 // : 2/3
k = 1/6/2/3
k = 1/4
k = 1/4
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