$x^2-6x\:-16$
$\lim_{x\to1}\left(x^{\frac{2}{x-1}}\right)$
$\frac{x^2+8x+12}{x^2+3-18}$
$\frac{\frac{1}{\sqrt{x}}}{x+3}$
$9x^2-36x+81$
$24^2\cdot34$
$53^3-43^{-2}-2+6-2^{-2}-7-2^3$
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