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k in (-oo:+oo)
(4/7)*k-(5*k)+8 = 367/42 // - 367/42
(4/7)*k-(5*k)-(367/42)+8 = 0
(4/7)*k-5*k-367/42+8 = 0
-31/7*k-31/42 = 0 // + 31/42
-31/7*k = 31/42 // : -31/7
k = 31/42/(-31/7)
k = -1/6
k = -1/6
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