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x in (-oo:+oo)
x = (450*x*x^2)/100 // - (450*x*x^2)/100
x-((450*x*x^2)/100) = 0
(-9/2)*x^3+x = 0
x-9/2*x^3 = 0
x*(1-9/2*x^2) = 0
-9/2*x^2 = -1 // : -9/2
x^2 = 2/9
x^2 = 2/9 // ^ 1/2
abs(x) = (2/9)^(1/2)
x = (2/9)^(1/2) or x = -(2/9)^(1/2)
x = 0
x = 0
x in { (2/9)^(1/2), -(2/9)^(1/2), 0 }
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