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k in (-oo:+oo)
5-4*k = (1/3)*k-8 // - (1/3)*k-8
5-4*k-((1/3)*k)+8 = 0
(-1/3)*k-4*k+5+8 = 0
13-13/3*k = 0 // - 13
-13/3*k = -13 // : -13/3
k = -13/(-13/3)
k = 3
k = 3
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