$\frac{x^3}{\left(x-3\right)^2}$
$\left(x+13\right)\left(x-20\right)$
$n^2+4n^2+5n^2$
$2x^3-21x^2+27x$
$5\left[6+2\left(7-4\right)\right]$
$6\left(10+\left(35\right)+14\right)$
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