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D( p )
100-(5*p) = 0
100-(5*p) = 0
100-(5*p) = 0
100-5*p = 0
100-5*p = 0 // - 100
-5*p = -100 // : -5
p = -100/(-5)
p = 20
p in (-oo:20) U (20:+oo)
-2/(-5) = p/(100-(5*p)) // - p/(100-(5*p))
-(p/(100-(5*p)))-2/(-5) = 0
-(p/(100-5*p))-2/(-5) = 0
(-1*p)/(100-5*p)+2/5 = 0
(-1*5*p)/(5*(100-5*p))+(2*(100-5*p))/(5*(100-5*p)) = 0
2*(100-5*p)-1*5*p = 0
200-15*p = 0
(200-15*p)/(5*(100-5*p)) = 0
(200-15*p)/(5*(100-5*p)) = 0 // * 5*(100-5*p)
200-15*p = 0
200-15*p = 0 // - 200
-15*p = -200 // : -15
p = -200/(-15)
p = 40/3
p = 40/3
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