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p in (-oo:+oo)
16*p^9+p*((20*p^7)/4) = 0
16*p^9+5*p^8 = 0
p^8*(16*p+5) = 0
16*p+5 = 0 // - 5
16*p = -5 // : 16
p = -5/16
p^8 = 0
1*p^8 = 0 // : 1
p^8 = 0
p = 0
p in { -5/16, 0 }
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