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D( p )
(p-3)^2 = 0
(p-3)^2 = 0
(p-3)^2 = 0
p-3 = 0 // + 3
p = 3
p in (-oo:3) U (3:+oo)
(2*p-3)/((p-3)^2) = 0
2*p-3 = 0 // + 3
2*p = 3 // : 2
p = 3/2
p = 3/2
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