$\lim_{n\to\infty}\left(\frac{n+2}{x^2-4}\right)$
$455-\left(-90\right)$
$-x^2-100$
$-1-\left(-6\right)+\left(+3\right)$
$54x<-136$
$3pq-2pr+4pq-3pr-pq$
$-7c+-8c+-2c$
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