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k in (-oo:+oo)
8-3*k-(2*k) = 66/7 // - 66/7
8-3*k-(2*k)-(66/7) = 0
8-3*k-2*k-66/7 = 0
-5*k-10/7 = 0 // + 10/7
-5*k = 10/7 // : -5
k = 10/7/(-5)
k = -2/7
k = -2/7
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