Expressing x in terms of other variables...

I think i have the hang of these but I wanna check with you guys to make sure..so could you tell me if this is right?

Express x in terms of other variables:

Also could I have help with the following:

Make the letter in brackets the subject of the formula in each of the following:

...(x)

Is it just the same method as the first problem?

Re: Expressing x in terms of other variables...

Great work so far! Start the second by multiplying both sides by 3.

Re: Expressing x in terms of other variables...