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D( p )
p+1 = 0
p+1 = 0
p+1 = 0
p+1 = 0 // - 1
p = -1
p in (-oo:-1) U (-1:+oo)
5/(p+1) = 12/(p+1) // - 12/(p+1)
5/(p+1)-(12/(p+1)) = 0
5/(p+1)-12*(p+1)^-1 = 0
5/(p+1)-12/(p+1) = 0
5-12 = 0
-7 = 0
-7/(p+1) = 0
-7/(p+1) = 0 // * p+1
-7 = 0
p belongs to the empty set
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