8/9 minus 7/12 is 11/36
9/12 - 7/12 = 2/12 or 1/6
7/9 minus 2/9 is 5/9
7/12 - 3/8 = 14/24 - 9/24 = 5/24.
1 -------- 9-7 -------- 9
9/10 minus 7/8 is 1/40
7/9 minus 3/4 is 1/36
1 and 9/12 minus 5/6 = 11/12
Expressed as a proper fraction in its simplest form, 11/12 - 9/20 = 7/15
5/12 - 9/12 = -4/12
The answer is -3 over 9
7/9 - 3/9 = 4/9