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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(0.15*p^-3)/2 = 7 // - 7
(0.15*p^-3)/2-7 = 0
0.075*p^-3 = 7 // : 0.075
p^-3 = 93.33333333
-3 < 0
1/(p^3) = 93.33333333 // * p^3
1 = 93.33333333*p^3 // : 93.33333333
0.01071429 = p^3
p^3 = 0.01071429 // ^ 1/3
p = 0.01071429^(1/3)
p = 0.01071429^(1/3)
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