Hello,

I tried to use SymPy.jl to solve a simple equation, but it fails. It eats more and more memory until the computer stalls.

Two questions:

a) where can I file a bug report?

b) how can I solve this equation in Julia?

```
using SymPy
@syms pressure_ground positive=true pressure_air positive=true temperature positive=true height positive=true
eqn = ((pressure_ground / pressure_air) ^ (1.0 / 5.257) - 1.0) * (temperature + 273.15) / 0.0065 - height
solve([eqn], [temperature])
```