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k in (-oo:+oo)
(2/7)*k-(3/8) = 18/8 // - 18/8
(2/7)*k-(3/8)-(18/8) = 0
(2/7)*k-3/8-9/4 = 0
2/7*k-21/8 = 0 // + 21/8
2/7*k = 21/8 // : 2/7
k = 21/8/2/7
k = 147/16
k = 147/16
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