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k in (-oo:+oo)
(5/7)*k = 5/8 // - 5/8
(5/7)*k-(5/8) = 0
(5/7)*k-5/8 = 0
5/7*k-5/8 = 0 // + 5/8
5/7*k = 5/8 // : 5/7
k = 5/8/5/7
k = 7/8
k = 7/8
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