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p in (-oo:+oo)
500 = (4*p^3)/2 // - (4*p^3)/2
500-((4*p^3)/2) = 0
500-2*p^3 = 0
-2*p^3 = -500 // : -2
p^3 = 250
p^3 = 250 // ^ 1/3
p = 5*2^(1/3)
p = 5*2^(1/3)
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