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D( p )
-p = 0
3*p = 0
-p = 0
p = 0
3*p = 0
3*p = 0
3*p = 0 // : 3
p = 0
p in (-oo:0) U (0:+oo)
-(1/(3*p))-(3/2) = -3/(-p) // + -3/(-p)
-(1/(3*p))-(-3/(-p))-(3/2) = 0
(-1/3)*p^-1-3*p^-1-3/2 = 0
-10/3*p^-1 = 3/2 // : -10/3
p^-1 = -9/20
-1 < 0
1/(p^1) = -9/20 // * p^1
1 = -9/20*p^1 // : -9/20
-20/9 = p^1
p = -20/9
p = -20/9
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