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D( p )
2*p = 0
5-p = 0
2*p = 0
2*p = 0
2*p = 0 // : 2
p = 0
5-p = 0
5-p = 0
5-p = 0 // - 5
-p = -5 // * -1
p = 5
p in (-oo:0) U (0:5) U (5:+oo)
4/(5-p) = 12/(2*p) // - 12/(2*p)
4/(5-p)-(12/(2*p)) = 0
4/(5-p)-6*p^-1 = 0
4/(5-p)-6/p = 0
(4*p)/(p*(5-p))+(-6*(5-p))/(p*(5-p)) = 0
4*p-6*(5-p) = 0
10*p-30 = 0
(10*p-30)/(p*(5-p)) = 0
(10*p-30)/(p*(5-p)) = 0 // * p*(5-p)
10*p-30 = 0
10*p-30 = 0 // + 30
10*p = 30 // : 10
p = 30/10
p = 3
p = 3
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