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d in (-oo:+oo)
6/35 = d+4/7 // - d+4/7
6/35-d-(4/7) = 0
6/35-d-4/7 = 0
-d-2/5 = 0 // + 2/5
-d = 2/5 // * -1
d = -2/5
d = -2/5
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