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k in (-oo:+oo)
(5/7)*k = 40/63 // - 40/63
(5/7)*k-(40/63) = 0
(5/7)*k-40/63 = 0
5/7*k-40/63 = 0 // + 40/63
5/7*k = 40/63 // : 5/7
k = 40/63/5/7
k = 8/9
k = 8/9
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