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k in (-oo:+oo)
4*k+5/8 = 137/40 // - 137/40
4*k+5/8-(137/40) = 0
4*k+5/8-137/40 = 0
4*k-14/5 = 0 // + 14/5
4*k = 14/5 // : 4
k = 14/5/4
k = 7/10
k = 7/10
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