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k in (-oo:+oo)
2/3 = (3/2)*((4/9)*k-4) // - (3/2)*((4/9)*k-4)
2/3-((3/2)*((4/9)*k-4)) = 0
(-3/2)*((4/9)*k-4)+2/3 = 0
2/3-3/2*(4/9*k-4) = 0
(-3/2*3*(4/9*k-4))/3+2/3 = 0
2-3/2*3*(4/9*k-4) = 0
20-2*k = 0
(20-2*k)/3 = 0
(20-2*k)/3 = 0 // * 3
20-2*k = 0
20-2*k = 0 // - 20
-2*k = -20 // : -2
k = -20/(-2)
k = 10
k = 10
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