25 1 / 3 - [(20-15 3 / 4) + (13 3 / 4-17)]

25 1 / 3 - [(20-15 3 / 4) + (13 3 / 4-17)]

Original formula = 25 + 1 / 3-20 + 15 + 3 / 4-13-3 / 4 + 17
=(25-20+15-13+17)+1/3+(3/4-3/4)
=24+1/3
=24 and 1 / 3