Eight minus two thirds would be seven and one third.
minus one fifteenth (-1/15)
Two and one fifteenth.
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.
Eight and two thirds
seven and two-thirds
who the hell knows
minus three fifths
One minus two thirds is one third.