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u in (-oo:+oo)
u/8 = 7/3 // - 7/3
u/8-(7/3) = 0
u/8-7/3 = 0
1/8*u-7/3 = 0 // + 7/3
1/8*u = 7/3 // : 1/8
u = 7/3/1/8
u = 56/3
u = 56/3
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