$-n+4\left(4n+1\right)$
$\int x^3e^{-3x^2}dx$
$10x+xz$
$5x+6=21$
$-6^5$
$\frac{y+xz}{2\sqrt{xy}}-\frac{z}{2\sqrt{y}}$
$\lim_{x\to7}\left(\frac{2x^2-5x-63}{x-4}\right)$
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