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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
55/p = 22/8 // - 22/8
55/p-(22/8) = 0
55/p-11/4 = 0
55*p^-1 = 11/4 // : 55
p^-1 = 1/20
-1 < 0
1/(p^1) = 1/20 // * p^1
1 = 1/20*p^1 // : 1/20
20 = p^1
p = 20
p = 20
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