$\frac{d^{20}}{dx^{20}}\left(x\cdot e^x\right)$
$m^4n^2-49$
$-4=\frac{x}{5}+6$
$-19a+5b-7a-13b-14a-80b$
$25b^2+35b^4-45b^5$
$\left(5x+y^2\right)^2$
$\tan\left(x\right)=\frac{9}{4}$
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