### Selecting specific solutions in Sage

I have the following solution:

```
solve(...)=[[xa1 == R*a/((a + b)*p1), xa2 == R*b/(a + b), l1 == (a + b)*(R*b/(a + b))^b*(R*a/((a + b)*p1))^a/R]]
```

Im aware I can get the whole set of solutions back with the use of

```
solve(...)[0]
[xa1 == R*a/((a + b)*p1), xa2 == R*b/(a + b), l1 == (a + b)*(R*b/(a + b))^b*(R*a/((a + b)*p1))^a/R]
```

Im only interested in getting back `xa1`

. Is there a way to do that?