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