7/8 = 21/24
7/12 = 14/24
21/24 - 14/24 = 7/24
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you need to equal them out, so it is actually 48 over 56 (times by 8) subtract 7 over 56 (times by 7). so the answer is 41 over 56.
(3/8) / (7/12) = 3/8 * 12/7 = (3*12)/(8*7) = (3*3)/(2/7) = 9/14
8/12 - 7/12 = 1/128/12 - 7/12 = 1/128/12 - 7/12 = 1/128/12 - 7/12 = 1/12
You get 50.
7/12 + 8/12 = 15/12 = 1 and 3/12 = 1 and 1/4