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u in (-oo:+oo)
u^2 = 4/25 // - 4/25
u^2-(4/25) = 0
u^2-4/25 = 0
1*u^2 = 4/25 // : 1
u^2 = 4/25
u^2 = 4/25 // ^ 1/2
abs(u) = 2/5
u = 2/5 or u = -2/5
u in { 2/5, -2/5 }
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