$\left(x^3+1\right)\left(x^2+x+1\right)$
$x^2+15=31$
$\left(-\frac{3}{5}xy^2\right)^2$
$n+2=-13$
$2x^4y^{-8}z^{-1}$
$\frac{\left(4m+8m\right)}{2m}$
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