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k in (-oo:+oo)
(4/7)*k+1 = 53/49 // - 53/49
(4/7)*k-(53/49)+1 = 0
(4/7)*k-53/49+1 = 0
4/7*k-4/49 = 0 // + 4/49
4/7*k = 4/49 // : 4/7
k = 4/49/4/7
k = 1/7
k = 1/7
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