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x in (-oo:+oo)
x = x*((10*x^2)/2) // - x*((10*x^2)/2)
x-(x*((10*x^2)/2)) = 0
x-5*x^3 = 0
x-5*x^3 = 0
x*(1-5*x^2) = 0
-5*x^2 = -1 // : -5
x^2 = 1/5
x^2 = 1/5 // ^ 1/2
abs(x) = (1/5)^(1/2)
x = (1/5)^(1/2) or x = -(1/5)^(1/2)
x = 0
x = 0
x in { (1/5)^(1/2), -(1/5)^(1/2), 0 }
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