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k in (-oo:+oo)
(1/3)*(9*k-6) = 7 // - 7
(1/3)*(9*k-6)-7 = 0
1/3*(9*k-6)-7 = 0
1/3*(9*k-6)-7 = 0
3*k-9 = 0
3*k-9 = 0
3*k-9 = 0 // + 9
3*k = 9 // : 3
k = 9/3
k = 3
k = 3
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