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k in (-oo:+oo)
(2/3)*(k-9) = 4*(k-19) // - 4*(k-19)
(2/3)*(k-9)-(4*(k-19)) = 0
(2/3)*(k-9)-4*(k-19) = 0
2/3*(k-9)-4*(k-19) = 0
2/3*(k-9)-4*(k-19) = 0
70-10/3*k = 0
70-10/3*k = 0
70-10/3*k = 0 // - 70
-10/3*k = -70 // : -10/3
k = -70/(-10/3)
k = 21
k = 21
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