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k in (-oo:+oo)
k-(1/3) = 7*k-(173/33) // - 7*k-(173/33)
k-(7*k)-(1/3)+173/33 = 0
k-7*k-1/3+173/33 = 0
54/11-6*k = 0 // - 54/11
-6*k = -54/11 // : -6
k = -54/11/(-6)
k = 9/11
k = 9/11
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