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k in (-oo:+oo)
3*k-(1/3) = 4/9 // - 4/9
3*k-(1/3)-(4/9) = 0
3*k-1/3-4/9 = 0
3*k-7/9 = 0 // + 7/9
3*k = 7/9 // : 3
k = 7/9/3
k = 7/27
k = 7/27
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