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D( p )
p+4 = 0
p+4 = 0
p+4 = 0
p+4 = 0 // - 4
p = -4
p in (-oo:-4) U (-4:+oo)
(2*p)/(p+4) = 1 // - 1
(2*p)/(p+4)-1 = 0
(2*p)/(p+4)+(-1*(p+4))/(p+4) = 0
2*p-1*(p+4) = 0
p-4 = 0
(p-4)/(p+4) = 0
(p-4)/(p+4) = 0 // * p+4
p-4 = 0
p-4 = 0 // + 4
p = 4
p = 4
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