.AlgebraicExpand() hangs on C * (2 ^ (x + 1))

```
using System;
using Symbolism;
using Symbolism.AlgebraicExpand;

namespace my
{
    public class My
    {
        static void Main(string[] args)
        {
            var C = new Symbol("C");
            var x = new Symbol("x");
            var t = C * (2 ^ (x + 1));
            Console.WriteLine("before hang");
            t.AlgebraicExpand();
        }
    }
}
```
