3 5/12+5 1/6=8 5/12+2/12=8 7/12
12 1/4-8 7/12=4 3/12-7/12=4-4/12=3 8/12=3 2/3
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3 5/12+5 1/6=8 5/12+2/12=8 7/12
12 1/4-8 7/12=4 3/12-7/12=4-4/12=3 8/12=3 2/3