Question

make x the subject y=3x-2

Answer 1

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