What is the formula for newton's third law of motion

The third law states that all forces between two objects exist in equal magnitude and opposite direction: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal in magnitude and opposite in direction: FA = - FB.

Explanation:

You can literally google this. It would have been faster.

The formula would be Fa = - Fb