The denominators are equal, so you can just add the numerators exactly. They add up to 9 over 12.
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It is the same as: 8/12 plus 1/12 = 9/12 or as 3/4 simplified
5 over 8 + 7 over 8 = 12 over 8 or 1 1/2
12/8 or 1 and 1/2
1/8 + 7/12 = 3/24 + 14/24 = 17/24.
(3/8)+(1/12)=(36/96)+(8/96)=(44/96) = 11/24.