-7/15+(-4/5)

4 / 5 = 4 * 3 / ( 5 * 3 ) = 12 / 15

- 7 / 15 + ( - 4 / 5 ) =

- 7 / 15 - 4 / 5 =

- 7 / 15 - 12 / 15 =

- 19 / 15