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