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