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k in (-oo:+oo)
(1/3)*k-(3*k)+2/5 = 6/5 // - 6/5
(1/3)*k-(3*k)+2/5-(6/5) = 0
(1/3)*k-3*k+2/5-6/5 = 0
-8/3*k-4/5 = 0 // + 4/5
-8/3*k = 4/5 // : -8/3
k = 4/5/(-8/3)
k = -3/10
k = -3/10
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