$40+30-10$
$x^4-30x+3\::\:x-3$
$16x^2+4y$
$\frac{d}{dx}\left(3x^2-4e^y=5\right)$
$x+13=221$
$\frac{6x-12}{\left|x-2\right|\left|x+3\right|}$
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