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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)
20/(p-4)-((5*p)/(p-4)) = 0
20/(p-4)-5*p*(p-4)^-1 = 0
20/(p-4)+(-5*p)/(p-4) = 0
20-5*p = 0
(20-5*p)/(p-4) = 0
(20-5*p)/(p-4) = 0 // * p-4
20-5*p = 0
20-5*p = 0 // - 20
-5*p = -20 // : -5
p = -20/(-5)
p = 4
p in { 4}
p belongs to the empty set
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