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k in (-oo:+oo)
8*(4*k-(1/3)) = 12*k-1 // - 12*k-1
8*(4*k-(1/3))-(12*k)+1 = 0
8*(4*k-1/3)-12*k+1 = 0
8*(4*k-1/3)-12*k+1 = 0
20*k-8/3+1 = 0
20*k-5/3 = 0
20*k-5/3 = 0
20*k-5/3 = 0 // + 5/3
20*k = 5/3 // : 20
k = 5/3/20
k = 1/12
k = 1/12
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