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k in (-oo:+oo)
6*(1/2-(k/3)) = 6*(1/6) // - 6*(1/6)
6*(1/2-(k/3))-(6*(1/6)) = 0
6*(1/2-(k/3))-1 = 0
6*(1/2-1/3*k)-1 = 0
6*(1/2-1/3*k)-1 = 0
2-2*k = 0
2-2*k = 0
2-2*k = 0 // - 2
-2*k = -2 // : -2
k = -2/(-2)
k = 1
k = 1
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