$a^2-14a+13$
$\left(5-y\right)^2$
$-\frac{3}{2}\left(-\frac{4}{5}\right)\left(-\frac{15}{9}\right)$
$100x^2+26x$
$\frac{x^2+1}{x^2-1}$
$\left(x^2-3x+1\right)\left(x^2-1\right)$
$\frac{9}{16}^6+x^7+\frac{4}{9}x^8$
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