$a+\frac{1}{a^2}-2a-3$
$5m^2\:and\:5m$
$xdy=3dx$
$\frac{31}{30}+\frac{25}{36}+0.01$
$169-26n+n^2$
$81x^2-49a^4$
$\left(x+5\right)\left(x-5\right)\left(x^2\right)$
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