$23^2-33+3^2$
$\left(2a-1\right)\left(2a-2\right)$
$-45+-90+-9$
$\lim_{x\to3}\left(\frac{1}{x-3}-\frac{1}{\sqrt{x}-\sqrt{3}}\right)$
$x^3\cdot y^6-1$
$\frac{4}{5}x+\frac{3}{4}=\frac{1}{2}x-\frac{3}{4}$
$2x^2+2\sqrt{2x}+1$
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