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u in (-oo:+oo)
3/8 = u/5 // - u/5
3/8-(u/5) = 0
3/8-1/5*u = 0 // - 3/8
-1/5*u = -3/8 // : -1/5
u = -3/8/(-1/5)
u = 15/8
u = 15/8
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