$5w^2-13w-6$
$\frac{du}{dr}=\frac{5+\sqrt{r}}{2+\sqrt{u}}$
$\frac{b}{5}+3=7$
$1+7k+k+6$
$63\cdot30$
$\lim_{x\to4}\frac{x-4\left(x-3\right)}{x-4}$
$\frac{2}{x-1}=\frac{5}{x+2}$
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