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k in (-oo:+oo)
6-(7*k) = 1/2-k // - 1/2-k
k-(7*k)-(1/2)+6 = 0
k-7*k-1/2+6 = 0
11/2-6*k = 0 // - 11/2
-6*k = -11/2 // : -6
k = -11/2/(-6)
k = 11/12
k = 11/12
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