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k in (-oo:+oo)
3*k-(1/3) = 4 // - 4
3*k-(1/3)-4 = 0
3*k-1/3-4 = 0
3*k-13/3 = 0 // + 13/3
3*k = 13/3 // : 3
k = 13/3/3
k = 13/9
k = 13/9
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