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u in (-oo:+oo)
u/5 = 12.5 // - 12.5
u/5-12.5 = 0
1/5*u-12.5 = 0 // + 12.5
1/5*u = 12.5 // : 1/5
u = 12.5/1/5
u = 62.5
u = 62.5
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