X/3bA^2 = 2c... The question, just rearranged so it's simpler to think out.
Now we have to make X, the subject
If something is divided by another thing and you wish to make the whatever is on the top the subject, in this case X. You simply multiply the bottom to each side of the question.
X =(A^2) (3B) (2C)
=6A^2BC