You can
put this solution on YOUR website!You are given an equation that gives x in terms of f. You are asked to 'solve' the equation so that is shows f in terms of x.
Basically, you are being asked to rearrange the equation so that f is on one side of the equal sign and everything else is on the other side.
In this equation, it is a one step process.

Now, divide both sides by 6. Remember, an equation stays 'true' as long as what you do to one side, you also do to the other side (except division by 0)
And now you have f on one side and everything else on the other.