Hey!
Here is the equation:

The denominator for the two fractions are:
and

Since they DO NOT have the same denominator, you need to change them. To do that, first find the LCM of the 2 numbers by listing their multiples and finding the common ones.
3 - 3, 6, 9, 12, 15, 18
9 - 9, 18, 27, 36, 45
In the multiples listed above, the common ones are 9 and 18. Since 9 is less than 18, the new denominator should be 9. Now you can change the fractions.


Here is your new equation:

Add the fractions:

is an improper fraction, so you can simplify it.

Your answer is:

Good luck! If you have any questions, feel free to ask in the comments!