7/36 is the simplest form.
7/9
It is: 21/36 = 7/12 simplified
It is: 36/42 = 6/7 simplified
3/4 + 7/9 = 27/36 + 28/36 = 55/36 which cannot be simplified further.
36/84 = 3/7
7/12
9/7
4/7
It is 7/9.
It is: 36/84 = 3/7 simplified
Yes, 28 over 36 = 7 over 9
7/12