Make x the subject y=3x-2

First, let's add the two from both sides.

y + 2 = 3x - 2 + 2

y + 2 = 3x

Now, all we have to do is to divide both sides by 3.

(y + 2) / 3 = (3x) / 3

(y + 2) / 3 = x

And now, flip both sides around so it looks nicer.

x = (y + 2) / 3