5 1/6 - 2 2/3
convert to improper fractions:
5 1/6 = 31/6
2 2/3 = 8/3
find common denominator:
8/3 = 16/6
31/6 - 16/6 = 15/6
15/6 = 2 3/6 = 2 1/2
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