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u in (-oo:+oo)
u/7 = 13/5 // - 13/5
u/7-(13/5) = 0
u/7-13/5 = 0
1/7*u-13/5 = 0 // + 13/5
1/7*u = 13/5 // : 1/7
u = 13/5/1/7
u = 91/5
u = 91/5
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