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x in (-oo:+oo)
y = ((4*x^2)/4)*x^4 // - ((4*x^2)/4)*x^4
y-(((4*x^2)/4)*x^4) = 0
y-x^6 = 0
-1*x^6 = -y // : -1
x^6 = y
x^6 = y // ^ 1/6
abs(x) = y^(1/6)
x = y^(1/6) or x = -y^(1/6)
x in { y^(1/6), -y^(1/6) }
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