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p in (-oo:+oo)
((p^3)/4)*((p^1)/4-((3*p^5)/4)) = 0
((p^3)/4)*((-3/4)*p^5+p/4) = 0
1/4*p^3*(1/4*p-3/4*p^5) = 0
1/4*p-3/4*p^5 = 0
1/4*p*(1-3*p^4) = 0
-3*p^4 = -1 // : -3
p^4 = 1/3
p^4 = 1/3 // ^ 1/4
abs(p) = (1/3)^(1/4)
p = (1/3)^(1/4) or p = -(1/3)^(1/4)
1/4*p*(p-(1/3)^(1/4))*(p+(1/3)^(1/4)) = 0
1/4*1/4*p*p^3*(p-(1/3)^(1/4))*(p+(1/3)^(1/4)) = 0
( 1/4*p )
1/4*p = 0 // : 1/4
p = 0
( 1/4*p^3 )
1/4*p^3 = 0 // : 1/4
p^3 = 0
p = 0
( p+(1/3)^(1/4) )
p+(1/3)^(1/4) = 0 // - (1/3)^(1/4)
p = -(1/3)^(1/4)
( p-(1/3)^(1/4) )
p-(1/3)^(1/4) = 0 // + (1/3)^(1/4)
p = (1/3)^(1/4)
p in { 0, 0, -(1/3)^(1/4), (1/3)^(1/4) }
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