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k in (-oo:+oo)
(1/8)*k-(6/5) = (1/7)*k+4 // - (1/7)*k+4
(1/8)*k-((1/7)*k)-(6/5)-4 = 0
(1/8)*k+(-1/7)*k-6/5-4 = 0
-1/56*k-26/5 = 0 // + 26/5
-1/56*k = 26/5 // : -1/56
k = 26/5/(-1/56)
k = -1456/5
k = -1456/5
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