math

2/3 -3/5

first you balance the denominators

common denominator = 15

then you find what you multiplied to make it that denominator

5/5 x 2/3 3/3 x 3/5

10/15 -9/15

10/15 = 2/3 and 9/15 = 3/5
10/15 - 9/15 = 1/15

the answer is 1/15