Divide both sides by 9. This will cancel out 9 on the left side of the equation, leaving x alone. On the right side, 3/9 simplifies to 1/3. Therefore, since x is alone on the left side, this leaves you your answer:
Oh, dude, 9 times what equals 3? Well, if you're looking for the magic number, it's 1/3. Yeah, that's right, 9 times 1/3 equals 3. Mind-blowing, I know. Math can be wild sometimes, man.