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D( p )
7*p-7 = 0
7*p-7 = 0
7*p-7 = 0
7*p-7 = 0 // + 7
7*p = 7 // : 7
p = 7/7
p = 1
p in (-oo:1) U (1:+oo)
(5*p^2-(5*p))/(7*p-7) = 0
(5*p^2-5*p)/(7*p-7) = 0
5*p^2-5*p = 0
5*p*(p-1) = 0
p-1 = 0 // + 1
p = 1
5*p*(p-1) = 0
(5*p*(p-1))/(7*p-7) = 0
( 5*p )
5*p = 0 // : 5
p = 0
( p-1 )
p-1 = 0 // + 1
p = 1
p in { 1}
p = 0
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