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x in (-oo:+oo)
(2400*x-(3*x^2))/5000 = 0
(2400*x-3*x^2)/5000 = 0
2400*x-3*x^2 = 0
3*x*(800-x) = 0
800-x = 0 // - 800
-x = -800 // * -1
x = 800
3*x*(x-800) = 0
(3*x*(x-800))/5000 = 0
( 3*x )
3*x = 0 // : 3
x = 0
( x-800 )
x-800 = 0 // + 800
x = 800
x in { 0, 800 }
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