x^2*(9+x^4)=9*(81+x^2)
9x^2+x^6=729+9x^2
x^6=729
x1=3 x2=-3
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x^2*(9+x^4)=9*(81+x^2)
9x^2+x^6=729+9x^2
x^6=729
x1=3 x2=-3