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