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k in (-oo:+oo)
3*k-(7/3) = 9 // - 9
3*k-(7/3)-9 = 0
3*k-7/3-9 = 0
3*k-34/3 = 0 // + 34/3
3*k = 34/3 // : 3
k = 34/3/3
k = 34/9
k = 34/9
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