$\lim_{x\to-2}\left(\frac{r+2}{r-2}\right)$
$xy+4xy^2-2xy-xy^2$
$-\left(-6wb^2z^4\right)^2$
$\lim_{x\to5}\left(\frac{x-5}{x-25}\right)$
$\left(2x-4\right)\left(-5x-8\right)$
$xdx=dy$
$\left(3a-10^{x+y}b^3\right)^3$
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