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n in (-oo:+oo)
(71/2)/(41/2-(51/8)) = n // - n
(71/2)/(41/2-(51/8))-n = 0
(71/2)/(41/2-51/8)-n = 0
284/113-n = 0 // - 284/113
-n = -284/113 // * -1
n = 284/113
n = 284/113
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