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All numbers must be expressed in thirds in order to add or subtract them.

3 = 9/3

1 = 3/3

1 2/3 = 3/3 + 2/3 = 5/3

So, 3 - 1 2/3 = 9/3 - 5/3 = 4/3 = 1 1/3

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13y ago

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