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k in (-oo:+oo)
-((6/7)*k)-6 = -228/35 // + -228/35
-((6/7)*k)-(-228/35)-6 = 0
(-6/7)*k+228/35-6 = 0
18/35-6/7*k = 0 // - 18/35
-6/7*k = -18/35 // : -6/7
k = -18/35/(-6/7)
k = 3/5
k = 3/5
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