$2+3x\le5-x$
$\frac{du}{dr}=\frac{2+\sqrt{r}}{5+\sqrt{u}}$
$6a^2-48a-120$
$\left(5mn+6n^2y\right)^3$
$3\left(2x-8\right)-11x$
$\left(5a^3-2b^4\right)^2$
$\left(k-7\right)\left(k-10\right)$
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