$12s^3+10s^2-8s$
$81^2+36y+4$
$169x^4-121n^2$
$\left(m-6\right)^2$
$x^3+3+5x-2x^2\:.\:-2+x$
$\frac{\frac{d^2}{dx^2}\left(2\right)}{2x+7}$
$7\left(3+5\right)$
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