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d in (-oo:+oo)
76/77 = d+5/7 // - d+5/7
76/77-d-(5/7) = 0
76/77-d-5/7 = 0
3/11-d = 0 // - 3/11
-d = -3/11 // * -1
d = 3/11
d = 3/11
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