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D( p )
4*p = 0
p+3 = 0
4*p = 0
4*p = 0
4*p = 0 // : 4
p = 0
p+3 = 0
p+3 = 0
p+3 = 0 // - 3
p = -3
p in (-oo:-3) U (-3:0) U (0:+oo)
2/(p+3)-(1/(4*p)) = 0
2/(p+3)+(-1/4)*p^-1 = 0
2/(p+3)-1/(4*p) = 0
(2*4*p)/(4*p*(p+3))+(-1*(p+3))/(4*p*(p+3)) = 0
2*4*p-1*(p+3) = 0
7*p-3 = 0
(7*p-3)/(4*p*(p+3)) = 0
(7*p-3)/(4*p*(p+3)) = 0 // * 4*p*(p+3)
7*p-3 = 0
7*p-3 = 0 // + 3
7*p = 3 // : 7
p = 3/7
p = 3/7
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