$-n+4-9-5n$
$2x+3\left(5x-7\right)$
$\frac{d}{dx}\left(3xsiny+3sin2y=6cosy\right)$
$\frac{a}{6}-\frac{1}{6}$
$\sqrt{4\left(8\right)-24}$
$-6x+3y=36$
$\left(-2x+9\right)\left(9x-2\right)$
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