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k in (-oo:+oo)
8/9-((6/7)*k) = -376/63 // + -376/63
8/9-((6/7)*k)-(-376/63) = 0
(-6/7)*k+8/9+376/63 = 0
48/7-6/7*k = 0 // - 48/7
-6/7*k = -48/7 // : -6/7
k = -48/7/(-6/7)
k = 8
k = 8
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