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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
((5*p-5)/p)*(p*((8*p^2)/9)-9) = 0
((5*p-5)*(8/9*p^3-9))/p = 0
( 5*p-5 )
5*p-5 = 0 // + 5
5*p = 5 // : 5
p = 5/5
p = 1
( 8/9*p^3-9 )
8/9*p^3 = 9 // : 8/9
p^3 = 81/8
p^3 = 81/8 // ^ 1/3
p = (81/8)^(1/3)
p in { 1, (81/8)^(1/3) }
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