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p in (-oo:+oo)
(4/3)*p^2-1 = 0
4/3*p^2 = 1 // : 4/3
p^2 = 3/4
p^2 = 3/4 // ^ 1/2
abs(p) = (3/4)^(1/2)
p = (3/4)^(1/2) or p = -(3/4)^(1/2)
p in { (3/4)^(1/2), -(3/4)^(1/2) }
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