$\lim_{x\to0}\left(\frac{\left(-x+3\right)^2-9}{-3x}\right)$
$\left(8z-2y+6x\right)\left(4z-3y+2x\right)$
$\left(5m-4n\right)\left(5m+5n\right)$
$\int xsen\left(x\right)e^{-sx}dx$
$\frac{x}{x-2}-7=\frac{2}{x-2}$
$\left(l\:+\:5\right)\left(l\:-\:5\right)$
$\frac{24x-40}{8}$
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