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k in (-oo:+oo)
(1/2)*k+3/10 = (4/7)*k+13/35 // - (4/7)*k+13/35
(1/2)*k-((4/7)*k)+3/10-(13/35) = 0
(1/2)*k+(-4/7)*k+3/10-13/35 = 0
-1/14*k-1/14 = 0 // + 1/14
-1/14*k = 1/14 // : -1/14
k = 1/14/(-1/14)
k = -1
k = -1
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