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x in (-oo:+oo)
(10/2)*x^3-(2*x^2*x^2) = 0
(10/2)*x^3-2*x^4 = 0
5*x^3-2*x^4 = 0
x^3*(5-2*x) = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 5/2, 0 }
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