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k in (-oo:+oo)
(4/7)*k-(1/3) = 1/5 // - 1/5
(4/7)*k-(1/3)-(1/5) = 0
(4/7)*k-1/3-1/5 = 0
4/7*k-8/15 = 0 // + 8/15
4/7*k = 8/15 // : 4/7
k = 8/15/4/7
k = 14/15
k = 14/15
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