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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7*p*((-3*3*3*p*p^2)/p)-7 = 0
-189*p^3 = 7 // : -189
p^3 = -1/27
p^3 = -1/27 // ^ 1/3
p = -1/3
p = -1/3
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