| - | 8 | ( | x | + | 26 5 | ) | + | 12 | ( | 24 5 | − | x | ) | = | - | 9 |
| 方程左边 = | - | 8 | x | − | 8 | × | 26 5 | + | 12 | ( | 24 5 | − | x | ) |
| = | - | 8 | x | − | 208 5 | + | 12 | ( | 24 5 | − | x | ) |
| = | - | 8 | x | − | 208 5 | + | 12 | × | 24 5 | − | 12 | x |
| = | - | 8 | x | − | 208 5 | + | 288 5 | − | 12 | x |
| = | - | 20 | x | + | 16 |
| - | 20 | x | + | 16 | = | - | 9 |
| - | 20 | x | = | - | 9 | − | 16 |
| - | 20 | x | = | - | 25 |
| 25 | = | 20 | x |
| 20 | x | = | 25 |
| x | = | 25 | ÷ | 20 |
| = | 25 | × | 1 20 |
| = | 5 | × | 1 4 |
| x | = | 5 4 |
| x | = | 1.25 |