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k in (-oo:+oo)
(1/4)*k+4/7 = 193/252 // - 193/252
(1/4)*k+4/7-(193/252) = 0
(1/4)*k+4/7-193/252 = 0
1/4*k-7/36 = 0 // + 7/36
1/4*k = 7/36 // : 1/4
k = 7/36/1/4
k = 7/9
k = 7/9
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