28 = 36 x 7/9 = 36/9 x 7 = 4 x 7
7/9
7/12+5/9 is the same as 21/36+20/36 = 41/36
7/36
28/36 - 9/36 = 19/36
5/9 + 7/12 20/36 + 21/36 41/36 = 1 5/36
28/36 = 7/9 which = 0.777...
7 over 9.
21/36, or 7/12
5/4+7/9 = 73/36
1/12 + 7/9 is 31/36
3/4 + 7/9 = 27/36 + 28/36 = 55/36 which cannot be simplified further.
9/7