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k in (-oo:+oo)
(-1/2)*k-(4/7) = -27/35 // + -27/35
(-1/2)*k-(4/7)-(-27/35) = 0
(-1/2)*k-4/7+27/35 = 0
1/5-1/2*k = 0 // - 1/5
-1/2*k = -1/5 // : -1/2
k = -1/5/(-1/2)
k = 2/5
k = 2/5
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