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