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k in (-oo:+oo)
(7/8)*k-(1/2) = 1/3 // - 1/3
(7/8)*k-(1/2)-(1/3) = 0
(7/8)*k-1/2-1/3 = 0
7/8*k-5/6 = 0 // + 5/6
7/8*k = 5/6 // : 7/8
k = 5/6/7/8
k = 20/21
k = 20/21
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