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k in (-oo:+oo)
1/3-4*k-((1/3)*k) = -64/3 // + -64/3
1/3-4*k-((1/3)*k)-(-64/3) = 0
(-1/3)*k-4*k+1/3+64/3 = 0
65/3-13/3*k = 0 // - 65/3
-13/3*k = -65/3 // : -13/3
k = -65/3/(-13/3)
k = 5
k = 5
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