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p in (-oo:+oo)
((2/3)*(3*p-5)^4)/9 = 0
(2/3*(3*p-5)^4)/9 = 0
3*p-5 = 0 // + 5
3*p = 5 // : 3
p = 5/3
p in { 5/3, 5/3, 5/3, 5/3 }
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