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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2.7 = 81/p // - 81/p
2.7-(81/p) = 0
2.7-81*p^-1 = 0
-81*p^-1 = -2.7 // : -81
p^-1 = 0.03333333
-1 < 0
1/(p^1) = 0.03333333 // * p^1
1 = 0.03333333*p^1 // : 0.03333333
30.000003 = p^1
p = 30.000003
p = 30.000003
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