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x in (-oo:+oo)
(1/200)*x = (1/125)*x^3 // - (1/125)*x^3
(1/200)*x-((1/125)*x^3) = 0
(-1/125)*x^3+(1/200)*x = 0
1/200*x-1/125*x^3 = 0
1/25*x*(1/8-1/5*x^2) = 0
-1/5*x^2 = -1/8 // : -1/5
x^2 = 5/8
x^2 = 5/8 // ^ 1/2
abs(x) = (5/8)^(1/2)
x = (5/8)^(1/2) or x = -(5/8)^(1/2)
x/25 = 0
1/25*x = 0 // : 1/25
x = 0
x in { (5/8)^(1/2), -(5/8)^(1/2), 0 }
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