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