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k in (-oo:+oo)
(5/7)*k+4 = 199/56 // - 199/56
(5/7)*k-(199/56)+4 = 0
(5/7)*k-199/56+4 = 0
5/7*k+25/56 = 0 // - 25/56
5/7*k = -25/56 // : 5/7
k = -25/56/5/7
k = -5/8
k = -5/8
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