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u in (-oo:+oo)
6.25 = u/5 // - u/5
6.25-(u/5) = 0
6.25-1/5*u = 0 // - 6.25
-1/5*u = -6.25 // : -1/5
u = -6.25/(-1/5)
u = 31.25
u = 31.25
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