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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/8 = 50/p // - 50/p
3/8-(50/p) = 0
3/8-50*p^-1 = 0
-50*p^-1 = -3/8 // : -50
p^-1 = 3/400
-1 < 0
1/(p^1) = 3/400 // * p^1
1 = 3/400*p^1 // : 3/400
400/3 = p^1
p = 400/3
p = 400/3
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