(-15 3/4)-(-8 5/6) помошите прошу!!!!

-15 3/4-(-8 5/6)= -15 3/4+8 5/6= -15 9/12+8 10/12= -6 11/12 

- 63/4 + 53/6 = -189/12 + 106/12 = - 83/12 = -6 11/12.