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k in (-oo:+oo)
306/7 = 5*k-k-(2/7) // - 5*k-k-(2/7)
k-(5*k)+306/7+2/7 = 0
k-5*k+306/7+2/7 = 0
44-4*k = 0 // - 44
-4*k = -44 // : -4
k = -44/(-4)
k = 11
k = 11
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