$2\left(2\right)+3\left(1\left(6\right)+4\left(-2\right)\right)$
$3n^2-4n^2+9n-12$
$24f-4$
$x^2+50x+652$
$\lim_{x\to-\infty}\left(\frac{e^{x-1}}{x^{-1}}\right)$
$\lim_{x\to\infty}\left(2x^2\right)$
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