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k in (-oo:+oo)
5*k = 1/8 // - 1/8
5*k-(1/8) = 0
5*k-1/8 = 0
5*k-1/8 = 0 // + 1/8
5*k = 1/8 // : 5
k = 1/8/5
k = 1/40
k = 1/40
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