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k in (-oo:+oo)
(-1/2)*k-(1/2) = -5/7 // + -5/7
(-1/2)*k-(1/2)-(-5/7) = 0
(-1/2)*k-1/2+5/7 = 0
3/14-1/2*k = 0 // - 3/14
-1/2*k = -3/14 // : -1/2
k = -3/14/(-1/2)
k = 3/7
k = 3/7
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