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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)
-1.2/(-5) = p/(100-(5*p)) // - p/(100-(5*p))
-(p/(100-(5*p)))-1.2/(-5) = 0
-(p/(100-5*p))-1.2/(-5) = 0
(-1*p)/(100-5*p)+0.24 = 0
(-1*p)/(100-5*p)+(0.24*(100-5*p))/(100-5*p) = 0
0.24*(100-5*p)-1*p = 0
24-2.2*p = 0
(24-2.2*p)/(100-5*p) = 0
(24-2.2*p)/(100-5*p) = 0 // * 100-5*p
24-2.2*p = 0
24-2.2*p = 0 // - 24
-2.2*p = -24 // : -2.2
p = -24/(-2.2)
p = 10.90909091
p = 10.90909091
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