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u in (-oo:+oo)
u/781 = 70/71 // - 70/71
u/781-(70/71) = 0
u/781-70/71 = 0
1/781*u-70/71 = 0 // + 70/71
1/781*u = 70/71 // : 1/781
u = 70/71/1/781
u = 770
u = 770
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