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k in (-oo:+oo)
(7/5)*k-k = 2/5 // - 2/5
(7/5)*k-k-(2/5) = 0
(7/5)*k-k-2/5 = 0
2/5*k-2/5 = 0 // + 2/5
2/5*k = 2/5 // : 2/5
k = 2/5/2/5
k = 1
k = 1
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