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k in (-oo:+oo)
(1/2)*(k+2/3) = 3*(k-1) // - 3*(k-1)
(1/2)*(k+2/3)-(3*(k-1)) = 0
(1/2)*(k+2/3)-3*(k-1) = 0
1/2*(k+2/3)-3*(k-1) = 0
1/2*(k+2/3)-3*(k-1) = 0
10/3-5/2*k = 0
10/3-5/2*k = 0
10/3-5/2*k = 0 // - 10/3
-5/2*k = -10/3 // : -5/2
k = -10/3/(-5/2)
k = 4/3
k = 4/3
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