$x^8+26x^4+169$
$x^2-2x=27$
$4x^2-18x+13$
$\sqrt{x-1}+\frac{x^2}{x-2}$
$\left(y-6\right)\left(y-4\right)$
$x+4=3\left(x+12\right)$
$\lim_{x\to5}\left(\frac{x-5}{3-\sqrt{x+4}}\right)$
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