One step of solve this is :[![enter image description here](https://i.stack.imgur.com/d3FcL.png)](https://i.stack.imgur.com/d3FcL.png)

I dont understand, why $x+3\neq1$ ?
We solve it with function domain help.
If $\log\_3(1)^2$ this may exist but not true, and if $x+3\neq2$ may exist but not true. If $\log\_{1}(x+2)$ then $(x+2)^0$ is true.