$\left(a^2-9a+9\right)+\left(a^2+14a+49\right)-\left(8a-49\right)$
$\left(8m+3n\right)\left(8m-3n\right)$
$\frac{2-6x}{x^2+1}$
$\lim_{x\to\infty}\left(\left(\frac{1}{x-4}\right)\right)$
$x^2+x+1\le0$
$\lim_{n\to\infty}\left(\frac{2^n}{2^{2^n}}\right)$
$-2\left(x+5\right)=-2\left(x-2\right)+5$
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