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k in (-oo:+oo)
3*k-(4/6) = 5/6 // - 5/6
3*k-(4/6)-(5/6) = 0
3*k-2/3-5/6 = 0
3*k-3/2 = 0 // + 3/2
3*k = 3/2 // : 3
k = 3/2/3
k = 1/2
k = 1/2
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