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u in (-oo:+oo)
u/8 = 7/13 // - 7/13
u/8-(7/13) = 0
u/8-7/13 = 0
1/8*u-7/13 = 0 // + 7/13
1/8*u = 7/13 // : 1/8
u = 7/13/1/8
u = 56/13
u = 56/13
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