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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
425/p = 6800 // - 6800
425/p-6800 = 0
425*p^-1 = 6800 // : 425
p^-1 = 16
-1 < 0
1/(p^1) = 16 // * p^1
1 = 16*p^1 // : 16
1/16 = p^1
p = 1/16
p = 1/16
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