21/37-14/37+15/37

To add or subtract fractions, we need to have a common denominator. In this case, all the fractions have the same denominator of 37. Therefore, we can add and subtract the numerators directly.

(21/37) - (14/37) + (15/37) = (21 - 14 + 15) / 37 = 22/37

Therefore, the result of the subtraction and addition of these fractions is 22/37.