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p in (-oo:+oo)
p*((2*p^2)/9)-9 = 0
2/9*p^3 = 9 // : 2/9
p^3 = 81/2
p^3 = 81/2 // ^ 1/3
p = (81/2)^(1/3)
p = (81/2)^(1/3)
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