$9x+9x+9x$
$\frac{dy}{dx}=yxe^{x+8}$
$x+x+4+5-5y$
$7x-49=0$
$\left(k-4n\right)\left(k-3n\right)$
$\sqrt{x-2}\left(x+5\right)$
$\frac{1}{81}x^4-16$
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