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d in (-oo:+oo)
(5/7)*d+4/7 = 29/77 // - 29/77
(5/7)*d+4/7-(29/77) = 0
(5/7)*d+4/7-29/77 = 0
5/7*d+15/77 = 0 // - 15/77
5/7*d = -15/77 // : 5/7
d = -15/77/5/7
d = -3/11
d = -3/11
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