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D( p )
4*p = 0
3-p = 0
4*p = 0
4*p = 0
4*p = 0 // : 4
p = 0
3-p = 0
3-p = 0
3-p = 0 // - 3
-p = -3 // * -1
p = 3
p in (-oo:0) U (0:3) U (3:+oo)
2/(3-p)-(1/(4*p)) = 0
2/(3-p)+(-1/4)*p^-1 = 0
2/(3-p)-1/(4*p) = 0
(2*4*p)/(4*p*(3-p))+(-1*(3-p))/(4*p*(3-p)) = 0
2*4*p-1*(3-p) = 0
9*p-3 = 0
(9*p-3)/(4*p*(3-p)) = 0
(9*p-3)/(4*p*(3-p)) = 0 // * 4*p*(3-p)
9*p-3 = 0
9*p-3 = 0 // + 3
9*p = 3 // : 9
p = 3/9
p = 1/3
p = 1/3
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