$\frac{x-1}{x}\le2$
$-\left(-1-\left(1-\left(-1\right)\right)\right)-\left(\left(\left(-1\right)-1\right)+1\right)$
$\lim_{x\to0}\left(\frac{x^2-6x+8}{\left(x-1\right)^2-1}\right)$
$\left|-5-3\right|$
$27x^2+24x-16$
$2e^{-3x}\left(12\sin\left(2x\right)+5\right)$
$\left(a-2b\right)^2-\left(x+y\right)^2$
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