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k in (-oo:+oo)
2*k-8 = 7*k-(63/11) // - 7*k-(63/11)
2*k-(7*k)+63/11-8 = 0
2*k-7*k+63/11-8 = 0
-5*k-25/11 = 0 // + 25/11
-5*k = 25/11 // : -5
k = 25/11/(-5)
k = -5/11
k = -5/11
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