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k in (-oo:+oo)
(5/6)*k-(7*k) = 1/4 // - 1/4
(5/6)*k-(7*k)-(1/4) = 0
(5/6)*k-7*k-1/4 = 0
-37/6*k-1/4 = 0 // + 1/4
-37/6*k = 1/4 // : -37/6
k = 1/4/(-37/6)
k = -3/74
k = -3/74
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