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d in (-oo:+oo)
(6/7)*d+7 = 515/77 // - 515/77
(6/7)*d-(515/77)+7 = 0
(6/7)*d-515/77+7 = 0
6/7*d+24/77 = 0 // - 24/77
6/7*d = -24/77 // : 6/7
d = -24/77/6/7
d = -4/11
d = -4/11
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