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k in (-oo:+oo)
(1/2)*k+2/7 = 23/7 // - 23/7
(1/2)*k+2/7-(23/7) = 0
(1/2)*k+2/7-23/7 = 0
1/2*k-3 = 0 // + 3
1/2*k = 3 // : 1/2
k = 3/1/2
k = 6
k = 6
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