$-7+\left(5-\left(3-\left(2-8\right)\right)\right)$
$\left(c-4\right)\left(c+9\right)^2$
$\frac{2x^4-7x^3+2x^2-1}{x-3}$
$64x^2-8$
$-2z^2-12z$
$5\left(x-1\right)+16\left(2x+3\right)\le3\left(2x-7\right)-x$
$\lim_{x\to0}\left(\frac{4x-2\pi}{x^2}\right)$
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