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k in (-oo:+oo)
(2/7)*k-(3/8) = 19/8 // - 19/8
(2/7)*k-(3/8)-(19/8) = 0
(2/7)*k-3/8-19/8 = 0
2/7*k-11/4 = 0 // + 11/4
2/7*k = 11/4 // : 2/7
k = 11/4/2/7
k = 77/8
k = 77/8
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