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k in (-oo:+oo)
(4/7)*k+6*k-1 = 29/63 // - 29/63
(4/7)*k+6*k-(29/63)-1 = 0
(4/7)*k+6*k-29/63-1 = 0
46/7*k-92/63 = 0 // + 92/63
46/7*k = 92/63 // : 46/7
k = 92/63/46/7
k = 2/9
k = 2/9
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