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p in (-oo:+oo)
8*p-((8/9)*p^4) = 0
(-8/9)*p^4+8*p = 0
8*p-8/9*p^4 = 0
8*p*(1-1/9*p^3) = 0
-1/9*p^3 = -1 // : -1/9
p^3 = 9
p^3 = 9 // ^ 1/3
p = 9^(1/3)
8*p = 0
8*p = 0 // : 8
p = 0
p in { 9^(1/3), 0 }
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