$-\infty^4$
$\lim_{x\to-\infty}\left(\frac{x^3}{e^{-x}}\right)$
$\frac{2\tan3a}{1-\tan^23a}$
$\left(x-2y+3z+5\right)+\left(-3x+7y+2\right)$
$\left(m+2x^3\right)\cdot\left(m-2x^3\right)$
$5x-3y+5x-x-2y+9y$
$\frac{x}{2}=\frac{-4}{x-9}$
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