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p in (-oo:+oo)
((p^5)/2)*((p^7)/2-((p^5)/2)) = 0
1/2*p^5*(1/2*p^7-1/2*p^5) = 0
1/2*p^7-1/2*p^5 = 0
1/2*p^5*(p^2-1) = 0
1*p^2 = 1 // : 1
p^2 = 1
p^2 = 1 // ^ 1/2
abs(p) = 1
p = 1 or p = -1
1/2*p^5*(p-1)*(p+1) = 0
(1/2*p^5)^2*(p-1)*(p+1) = 0
( 1/2*p^5 )
1/2*p^5 = 0 // : 1/2
p^5 = 0
p = 0
( p+1 )
p+1 = 0 // - 1
p = -1
( p-1 )
p-1 = 0 // + 1
p = 1
p in { 0, 0, -1, 1 }
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