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D( x )
x < 0
x < 0
x in <0:+oo)
(600/150)*x^2.5 = x // - x
(600/150)*x^2.5-x = 0
4*x^2.5-x = 0
x*(4*x^1.5-1) = 0
4*x^1.5 = 1 // : 4
x^1.5 = 1/4
x = (1/4)^(1/0.5)
x = 0
x = 0
x in { (1/4)^(1/0.5), 0 }
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