$\frac{x^2-12x+18}{x^3-6x^2+9x}$
$\left|3-\frac{x}{2}\le\:2\right|$
$x^4-4xy=3$
$3x^2+4x-39$
$\lim_{x\to0}\left(\frac{x+2}{x-1}\right)^x$
$6ab-5a+4a^3b-9a^2b^2$
$\frac{w}{8}=2$
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