$8x-4$
$\lim_{x\to\infty}\left(\sqrt{x+2}\:-\:\sqrt{x+1}\right)$
$4a^4-9a^2$
$7-x\le4x+12$
$-16=4\left(a+6\right)$
$3\left(x+2\right)^2-4$
$-7.79+5.4$
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