Ok so first we find a common denominator for both fractions. The LCM of 6 and 9 is 18.
Then we multiply 1/9 by 18 = 2/18
Also we multiply 1/6 by 18 = 3/18
Then we add 2/18 + 3/18 = 5/18
18/18 - 5/18 = 13/18
Therfore the answer is H.
Hope this helps!
