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k in (-oo:+oo)
8*k = 4/6 // - 4/6
8*k-(4/6) = 0
8*k-2/3 = 0
8*k-2/3 = 0 // + 2/3
8*k = 2/3 // : 8
k = 2/3/8
k = 1/12
k = 1/12
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