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Converting to twelfths gives 9 twelfths minus 8 twelfths which is 1 twelfth.
Two quarters minus two thirds is negative one sixth. Two quarters is six twelfths, and two thirds is eight twelfths. Six twelfths minus eight twelfths is minus two twelfths or minus one sixth.
We convert this to twelfths to give: 10 twelfths + 4 twelfths + 9 twelfths = 23 twelfths or 1 and 11 twelfths.
3 2/3 minus 11/12 is 2 3/4 or 2.75
It is eleven twelfths.