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k in (-oo:+oo)
(5/7)*k-1 = -62/77 // + -62/77
(5/7)*k-(-62/77)-1 = 0
(5/7)*k+62/77-1 = 0
5/7*k-15/77 = 0 // + 15/77
5/7*k = 15/77 // : 5/7
k = 15/77/5/7
k = 3/11
k = 3/11
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