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