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k in (-oo:+oo)
5/3-k = (-1/2)*k+13/6 // - (-1/2)*k+13/6
5/3-k-((-1/2)*k)-(13/6) = 0
(1/2)*k-k+5/3-13/6 = 0
-1/2*k-1/2 = 0 // + 1/2
-1/2*k = 1/2 // : -1/2
k = 1/2/(-1/2)
k = -1
k = -1
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