$\left|-21\right|+\left|-45\right|$
$3p-2q+5q-5p+3-q$
$10-\left(-2-3\right)$
$\lim_{y\to-c}\left(\frac{y+c}{c^2+y^2}\right)$
$-3\cdot20$
$4n-6=250$
$\lim_{x\to-\infty}\frac{x+8}{x^2-1}$
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