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k in (-oo:+oo)
(2/3)*k-3*k-4 = -19/3 // + -19/3
(2/3)*k-3*k-(-19/3)-4 = 0
(2/3)*k-3*k+19/3-4 = 0
7/3-7/3*k = 0 // - 7/3
-7/3*k = -7/3 // : -7/3
k = -7/3/(-7/3)
k = 1
k = 1
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