$x^2-6x+8\le0$
$\left(7a^2b^2+5x^2\right)^2$
$\left(2a^{x-1}\right)^2$
$\lim_{x\to43}\left(\sqrt{x+6}-7\right)$
$\frac{20x^3}{10x^2}$
$3\left(x^2+3x-5\right)$
$x+xy+y=1$
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