I'm getting stuck trying to *separate*, and thus *solve* this differential equation. Here $y' := \frac{\mathrm dy}{\mathrm dx}$

> 
> $$y'=\ln(x+y)$$
> 
> 
> 

Is this differential separable using elementary functions? WolframAlpha is mentioning something about the [Exponential integral ($\text{E}\_i$)](https://en.wikipedia.org/wiki/Exponential_integral). We haven't been taught about this $\text{E}\_i$ term...