-5.25 -(-7.5) (Conversion to decimals cuz' it's easier for me to type) -5.25 + 7.5 (Subtracting a negative is like Adding a Positive) 7.5 - 5.25 (Rearranging) 2.25 (Subtracting) 2 1/4 Final Answer.
To do it w/o converting to decimals, make sure the fractions have the same denominator.
