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x in (-oo:+oo)
(a/4)*x^6 = 12 // - 12
(a/4)*x^6-12 = 0
1/4*a*x^6 = 12 // : 1/4*a
x^6 = 48*a^-1
x^6 = 48*a^-1 // ^ 1/6
abs(x) = 48^(1/6)*a^(-1/6)
x = 48^(1/6)*a^(-1/6) or x = -(48^(1/6)*a^(-1/6))
x in { 48^(1/6)*a^(-1/6), -(48^(1/6)*a^(-1/6)) }
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