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u in (-oo:+oo)
u/20 = 4/5 // - 4/5
u/20-(4/5) = 0
u/20-4/5 = 0
1/20*u-4/5 = 0 // + 4/5
1/20*u = 4/5 // : 1/20
u = 4/5/1/20
u = 16
u = 16
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