(5 + 4) - 7 + 8
5 + 4 - (7 - 8)
(5 + 4) - (7 - 8)
(5 + 4 - 7) + 8
5 + (4 - 7 + 8)
5 + (4 - 7) + 8
( (5 + 4) - 7) + 8
5 + (4 - (7 - 8))
(5 + (4 - 7)) + 8
5 + ((4 - 7) + 8)
5 + 4 - 7 + 8