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k in (-oo:+oo)
(1/5)*k-(3*k)+8 = 54/5 // - 54/5
(1/5)*k-(3*k)-(54/5)+8 = 0
(1/5)*k-3*k-54/5+8 = 0
-14/5*k-14/5 = 0 // + 14/5
-14/5*k = 14/5 // : -14/5
k = 14/5/(-14/5)
k = -1
k = -1
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