rearrange these to make x the subject
3X = Y
6X(SQUARED) + VX = Y
If so, multiply both sides of the equation by 3X.
Divide both sides by 3Y.
Add W to both sides.
Divide both sides by V.
Somehow, after looking at the first two, this one seems a bit out of place. I won't explain each step. I'll just perform them.
I don't know how clean that last one is. Maybe some others will critique it.