1:3 × (7 - 8 + 9)
2:3 × ((7 - 8) + 9)
3:3 × (7 - (8 - 9))
4:3 × (7 + 9 - 8)
5:3 × ((7 + 9) - 8)
6:3 × (7 + (9 - 8))
7:3 × (9 + 7 - 8)
8:3 × ((9 + 7) - 8)
9:3 × (9 + (7 - 8))
10:3 × (9 - 8 + 7)
11:3 × ((9 - 8) + 7)
12:3 × (9 - (8 - 7))
13:(7 - 8 + 9) × 3
14:((7 - 8) + 9) × 3
15:(7 - (8 - 9)) × 3
16:(7 + 9 - 8) × 3
17:((7 + 9) - 8) × 3
18:(7 + (9 - 8)) × 3
19:(9 + 7 - 8) × 3
20:((9 + 7) - 8) × 3
21:(9 + (7 - 8)) × 3
22:(9 - 8 + 7) × 3
23:((9 - 8) + 7) × 3
24:(9 - (8 - 7)) × 3