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k in (-oo:+oo)
5/8-((1/7)*k) = 7/24 // - 7/24
5/8-((1/7)*k)-(7/24) = 0
(-1/7)*k+5/8-7/24 = 0
1/3-1/7*k = 0 // - 1/3
-1/7*k = -1/3 // : -1/7
k = -1/3/(-1/7)
k = 7/3
k = 7/3
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