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Converting to twelfths gives 9 twelfths minus 8 twelfths which is 1 twelfth.
0.75 or three quarters is rational.
3 quarters is 9 twelfths, so 9 twelfths minus 3 twelfths is 6 twelfths, which is also a half.
Three eighths
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.