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p in (-oo:+oo)
(2/5)*(100-(5*p)) = 0
(2/5)*(100-5*p) = 0
2/5*(100-5*p) = 0
100-5*p = 0 // - 100
-5*p = -100 // : -5
p = -100/(-5)
p = 20
p = 20
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