$x^2-4x-77=0$
$2w+\left(y+w\right)$
$a\:-\:\frac{b\cdot c\:-\:c^2\cdot d}{e-c^2}$
$\frac{d}{dx}\left(arc\:cot\left(2-3x\right)\right)$
$a\left(x+1\right)+5a\left(x-1\right)=2\left(3b-2a\right)$
$\frac{n^2-25}{n-5}$
$\int_0^{\infty}\left(\sqrt{1+x}\right)dx$
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