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p in (-oo:+oo)
p^2-(6/13) = 0
p^2-6/13 = 0
1*p^2 = 6/13 // : 1
p^2 = 6/13
p^2 = 6/13 // ^ 1/2
abs(p) = (6/13)^(1/2)
p = (6/13)^(1/2) or p = -(6/13)^(1/2)
p in { (6/13)^(1/2), -(6/13)^(1/2) }
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