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k in (-oo:+oo)
(2/7)*k = 8/5 // - 8/5
(2/7)*k-(8/5) = 0
(2/7)*k-8/5 = 0
2/7*k-8/5 = 0 // + 8/5
2/7*k = 8/5 // : 2/7
k = 8/5/2/7
k = 28/5
k = 28/5
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