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Okay, so I have this algebraic expression in terms of P,G,J,K...etc

I want to solve it for the

How can I get around this and solve for P/G ?

I want to solve it for the

*expression*P/G (where I have the "?" below in the code). But Mathematica won't let me do this in the solve function. It says that P/G is not a valid variable name.How can I get around this and solve for P/G ?

Code:

```
Solve[((P*L^3)/(3*H*
J)) - ((5*L^3)/(48*H*J))*((40 L^3 M P)/(384 H J + 5 L^3 M)) -
G == 0, ?]
```

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