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k in (-oo:+oo)
(1/7)*k-6 = (3/7)*k+4 // - (3/7)*k+4
(1/7)*k-((3/7)*k)-6-4 = 0
(1/7)*k+(-3/7)*k-6-4 = 0
-2/7*k-10 = 0 // + 10
-2/7*k = 10 // : -2/7
k = 10/(-2/7)
k = -35
k = -35
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