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k in (-oo:+oo)
(2/7)*k-(3/7) = -19/8 // + -19/8
(2/7)*k-(3/7)-(-19/8) = 0
(2/7)*k-3/7+19/8 = 0
2/7*k+109/56 = 0 // - 109/56
2/7*k = -109/56 // : 2/7
k = -109/56/2/7
k = -109/16
k = -109/16
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