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p in (-oo:+oo)
56*p^5-(p*((14*p^2)/7)) = 0
56*p^5-2*p^3 = 0
56*p^5-2*p^3 = 0
2*p^3*(28*p^2-1) = 0
28*p^2 = 1 // : 28
p^2 = 1/28
p^2 = 1/28 // ^ 1/2
abs(p) = (1/28)^(1/2)
p = (1/28)^(1/2) or p = -(1/28)^(1/2)
2*p^3 = 0
2*p^3 = 0 // : 2
p^3 = 0
p = 0
p in { (1/28)^(1/2), -(1/28)^(1/2), 0 }
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