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k in (-oo:+oo)
k/6 = 13/26 // - 13/26
k/6-(13/26) = 0
k/6-1/2 = 0
1/6*k-1/2 = 0 // + 1/2
1/6*k = 1/2 // : 1/6
k = 1/2/1/6
k = 3
k = 3
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