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k in (-oo:+oo)
(5/7)*k = 1/9 // - 1/9
(5/7)*k-(1/9) = 0
(5/7)*k-1/9 = 0
5/7*k-1/9 = 0 // + 1/9
5/7*k = 1/9 // : 5/7
k = 1/9/5/7
k = 7/45
k = 7/45
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