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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/p+5 = -45 // + 45
2/p+5+45 = 0
2*p^-1 = -50 // : 2
p^-1 = -25
-1 < 0
1/(p^1) = -25 // * p^1
1 = -25*p^1 // : -25
-1/25 = p^1
p = -1/25
p = -1/25
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