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k in (-oo:+oo)
(-4/7)*k+1/3 = 5/231 // - 5/231
(-4/7)*k+1/3-(5/231) = 0
(-4/7)*k+1/3-5/231 = 0
24/77-4/7*k = 0 // - 24/77
-4/7*k = -24/77 // : -4/7
k = -24/77/(-4/7)
k = 6/11
k = 6/11
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