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k in (-oo:+oo)
k/2 = 5/7 // - 5/7
k/2-(5/7) = 0
k/2-5/7 = 0
1/2*k-5/7 = 0 // + 5/7
1/2*k = 5/7 // : 1/2
k = 5/7/1/2
k = 10/7
k = 10/7
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