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D( p )
p+6 = 0
p+6 = 0
p+6 = 0
p+6 = 0 // - 6
p = -6
p in (-oo:-6) U (-6:+oo)
(2*p)/(p+6) = 1 // - 1
(2*p)/(p+6)-1 = 0
(2*p)/(p+6)+(-1*(p+6))/(p+6) = 0
2*p-1*(p+6) = 0
p-6 = 0
(p-6)/(p+6) = 0
(p-6)/(p+6) = 0 // * p+6
p-6 = 0
p-6 = 0 // + 6
p = 6
p = 6
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