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