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