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k in (-oo:+oo)
1/5-((3/7)*k) = -26/245 // + -26/245
1/5-((3/7)*k)-(-26/245) = 0
(-3/7)*k+1/5+26/245 = 0
15/49-3/7*k = 0 // - 15/49
-3/7*k = -15/49 // : -3/7
k = -15/49/(-3/7)
k = 5/7
k = 5/7
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