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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/p+5/2 = 3/2 // - 3/2
2/p+5/2-(3/2) = 0
2/p+5/2-3/2 = 0
2*p^-1 = -1 // : 2
p^-1 = -1/2
-1 < 0
1/(p^1) = -1/2 // * p^1
1 = -1/2*p^1 // : -1/2
-2 = p^1
p = -2
p = -2
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