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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/p = -10 // + 10
5/p+10 = 0
5*p^-1 = -10 // : 5
p^-1 = -2
-1 < 0
1/(p^1) = -2 // * p^1
1 = -2*p^1 // : -2
-1/2 = p^1
p = -1/2
p = -1/2
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