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k in (-oo:+oo)
8-((3/8)*k) = k-4 // - k-4
4-((3/8)*k)-k+8 = 0
(-3/8)*k-k+4+8 = 0
12-11/8*k = 0 // - 12
-11/8*k = -12 // : -11/8
k = -12/(-11/8)
k = 96/11
k = 96/11
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