$x^2-289a^4$
$8x^2-16x+8$
$11d+5f-21d+5-8$
$\frac{x^2-8x+6}{x-4}$
$\frac{x^2+x-6}{x^2-9x+14}$
$\log_{\frac{1}{4}}\left(x^3y^{-4}\right)$
$-2x+x-x$
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