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k in (-oo:+oo)
(6/7)*k+1 = 37/7 // - 37/7
(6/7)*k-(37/7)+1 = 0
(6/7)*k-37/7+1 = 0
6/7*k-30/7 = 0 // + 30/7
6/7*k = 30/7 // : 6/7
k = 30/7/6/7
k = 5
k = 5
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