$2x+7x-6x+8$
$\frac{d}{dx}\sqrt{2}xy$
$3m+9m+4n$
$2x-7>1$
$-5x^2+30x+35=0$
$\left(n+16\right)^2$
$\int\frac{x}{x^2+4x+20}dx$
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