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k in (-oo:+oo)
(5/7)*k+4/5 = 103/35 // - 103/35
(5/7)*k+4/5-(103/35) = 0
(5/7)*k+4/5-103/35 = 0
5/7*k-15/7 = 0 // + 15/7
5/7*k = 15/7 // : 5/7
k = 15/7/5/7
k = 3
k = 3
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