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k in (-oo:+oo)
3*k-(7/3) = 5 // - 5
3*k-(7/3)-5 = 0
3*k-7/3-5 = 0
3*k-22/3 = 0 // + 22/3
3*k = 22/3 // : 3
k = 22/3/3
k = 22/9
k = 22/9
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