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u in (-oo:+oo)
12/25 = u/40 // - u/40
12/25-(u/40) = 0
12/25-1/40*u = 0 // - 12/25
-1/40*u = -12/25 // : -1/40
u = -12/25/(-1/40)
u = 96/5
u = 96/5
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