$a^2-31a-630$
$\left(2x\right)^7-1$
$2x-\frac{d}{dx}\left(y\right)=\frac{z}{x}$
$-4k^4+14+3k^2+\left(-3k^4-14k^2-8\right)$
$\left(x+\frac{1}{x}\right)^2$
$9v^2-w^2y^2$
$x+93=-108$
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