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x in (-oo:+oo)
y = (4/3)*x^16 // - (4/3)*x^16
y-((4/3)*x^16) = 0
(-4/3)*x^16+y = 0
-4/3*x^16 = -y // : -4/3
x^16 = 3/4*y
x^16 = 3/4*y // ^ 1/16
abs(x) = (3/4)^(1/16)*y^(1/16)
x = (3/4)^(1/16)*y^(1/16) or x = -((3/4)^(1/16)*y^(1/16))
x in { (3/4)^(1/16)*y^(1/16), -((3/4)^(1/16)*y^(1/16)) }
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