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