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k in (-oo:+oo)
(13/6)*k = 1/3 // - 1/3
(13/6)*k-(1/3) = 0
(13/6)*k-1/3 = 0
13/6*k-1/3 = 0 // + 1/3
13/6*k = 1/3 // : 13/6
k = 1/3/13/6
k = 2/13
k = 2/13
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