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k in (-oo:+oo)
(3/7)*k+5 = 400/77 // - 400/77
(3/7)*k-(400/77)+5 = 0
(3/7)*k-400/77+5 = 0
3/7*k-15/77 = 0 // + 15/77
3/7*k = 15/77 // : 3/7
k = 15/77/3/7
k = 5/11
k = 5/11
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