$\left(\frac{x^2}{9}-\frac{1}{x^2}\right)^4$
$x^2+4x+4=81$
$x^2y+xy^2+y$
$25u^2-64$
$\frac{x}{5}-17=3$
$625x^2-64$
$\left(15+8b\right)\left(15-8b\right)$
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