$420-350+200+60$
$6^{-3}+6^7$
$\left(4t^2u^6-4r^3s\right)^2$
$\frac{r^6-8}{r^2-2}$
$\frac{\left(1+e^x\right)}{1-e^{-y}}dy+e^{x+y}dx=0$
$\left(8y^5+3y^2\right)^2$
$5+7+9-12-32+31+-5$
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