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a^2-(((4/3)*x^9)/a)+2 = 0
a^2+(-4/3)*a^-1*x^9+2 = 0
-4/3*a^-1*x^9 = -(a^2+2) // : -4/3*a^-1
x^9 = 3/4*a*(a^2+2)
x^9 = 3/4*a*(a^2+2) // ^ 1/9
x = (3/4)^(1/9)*a^(1/9)*(a^2+2)^(1/9)
x = (3/4)^(1/9)*a^(1/9)*(a^2+2)^(1/9)
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