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k in (-oo:+oo)
(2/3)*(6*k-9) = 3*k+8 // - 3*k+8
(2/3)*(6*k-9)-(3*k)-8 = 0
(2/3)*(6*k-9)-3*k-8 = 0
2/3*(6*k-9)-3*k-8 = 0
2/3*(6*k-9)-3*k-8 = 0
k-8-6 = 0
k-14 = 0
k-14 = 0
k-14 = 0 // + 14
k = 14
k = 14
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