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k in (-oo:+oo)
(2/3)*(k-6) = 5*k-43 // - 5*k-43
(2/3)*(k-6)-(5*k)+43 = 0
(2/3)*(k-6)-5*k+43 = 0
2/3*(k-6)-5*k+43 = 0
2/3*(k-6)-5*k+43 = 0
43-13/3*k-4 = 0
39-13/3*k = 0
39-13/3*k = 0
39-13/3*k = 0 // - 39
-13/3*k = -39 // : -13/3
k = -39/(-13/3)
k = 9
k = 9
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