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