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k in (-oo:+oo)
(1/6)*k-(7*k)-3 = -331/42 // + -331/42
(1/6)*k-(7*k)-(-331/42)-3 = 0
(1/6)*k-7*k+331/42-3 = 0
205/42-41/6*k = 0 // - 205/42
-41/6*k = -205/42 // : -41/6
k = -205/42/(-41/6)
k = 5/7
k = 5/7
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