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p in (-oo:+oo)
p^2-(1/9) = 0
p^2-1/9 = 0
1*p^2 = 1/9 // : 1
p^2 = 1/9
p^2 = 1/9 // ^ 1/2
abs(p) = 1/3
p = 1/3 or p = -1/3
p in { 1/3, -1/3 }
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