$n^2-14n+7$
$5a^2-ab-5ab-5b^2$
$7y-8y+11x-12x$
$-4.3\cdot0.02$
$12r^2+36rs+27s^2$
$\lim_{x\to\infty}\left(\sqrt{x}\left(\sqrt{x+2}-\sqrt{x}\right)\right)$
$\sqrt[3]{u}=-5$
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