$\lim_{x\to3}\left(\frac{\sqrt{x}-\sqrt{3}}{3-x}\right)$
$\left(\frac{2}{3}x-\frac{3}{5}y\right)^2$
$-11mn\:-2mn$
$\left|90\right|$
$5+8-2\cdot6+3$
$6\cdot4-6\cdot2$
$\frac{x^2+x-20}{x-4}$
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