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u in (-oo:+oo)
u/5 = 13/8 // - 13/8
u/5-(13/8) = 0
u/5-13/8 = 0
1/5*u-13/8 = 0 // + 13/8
1/5*u = 13/8 // : 1/5
u = 13/8/1/5
u = 65/8
u = 65/8
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