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k in (-oo:+oo)
2*k-(5/3) = 4 // - 4
2*k-(5/3)-4 = 0
2*k-5/3-4 = 0
2*k-17/3 = 0 // + 17/3
2*k = 17/3 // : 2
k = 17/3/2
k = 17/6
k = 17/6
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