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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3*p-(((4*(3/p)*p^2)/9)*p)-9 = 0
(-4/3)*p^2+3*p-9 = 0
3*p-4/3*p^2-9 = 0
DELTA = 3^2-(-9*(-4/3)*4)
DELTA = -39
DELTA < 0
p belongs to the empty set
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