Which is the equation? (Langrangian POINT)

[astrozilla]

Homework Statement

Calculate the distance from Earth to L2.

Homework Equations

The mass of Earth is Given to be 6x10^24 kg

The Attempt at a Solution

L2 is the second langragian point,where the gravitational forces of the sun and the Earth balance.
The question is which equation to use ?

 

[Gokul43201]

L2 is the second langragian point,where the gravitational forces of the sun and the Earth balance.
The question is which equation to use ?

If you translated the above definition (of L2) into an equation (or a symbolic expression), what would it look like?