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p in (-oo:+oo)
p^2*((4*p^3+8*p^2+20*p)/4) = 0
(p^2*(4*p^3+8*p^2+20*p))/4 = 0
4*p^3+8*p^2+20*p = 0
4*p*(p^2+2*p+5) = 0
p^2+2*p+5 = 0
DELTA = 2^2-(1*4*5)
DELTA = -16
DELTA < 0
4*p = 0
(4*p*p^2)/4 = 0
( 4*p )
4*p = 0 // : 4
p = 0
( p^2 )
1*p^2 = 0 // : 1
p^2 = 0
p = 0
p in { 0, 0 }
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