### Problem with solve

Hi, I'm very very new in Sage. I have a problem trying this:

```
x=var('x')
f=10*(1-exp(-0.23*(x)))^2
g=20*(1-exp(0.23*(x-14)))^2-10
```

I'm want to get the intersection point(s). From Maple, I know there is three, but when I try to solve for x:

```
solve(f==g,x)
[ ]
```

Sage gives me that [ ]! What does it mean?
Thanks in advance