$\frac{36m^2-49m^2n^4}{6m-7mn^2}$
$-10x^2+7x+25\le0$
$9c-6+c$
$\lim_{x\to-1}\left(\frac{\left|x^2-5x-6\right|}{x+1}\right)$
$\frac{1}{2}\cdot\frac{4}{1}$
$64a^3-\:125b^3$
$ty'-3y=t^4$
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