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d in (-oo:+oo)
78/77 = d+2/7 // - d+2/7
78/77-d-(2/7) = 0
78/77-d-2/7 = 0
8/11-d = 0 // - 8/11
-d = -8/11 // * -1
d = 8/11
d = 8/11
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