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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
213/2 = 253/p // - 253/p
213/2-(253/p) = 0
213/2-253*p^-1 = 0
-253*p^-1 = -213/2 // : -253
p^-1 = 213/506
-1 < 0
1/(p^1) = 213/506 // * p^1
1 = 213/506*p^1 // : 213/506
506/213 = p^1
p = 506/213
p = 506/213
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