| ( | 1 | − | 1 | ÷ | 5 | ) | x | = | ( | x | − | 8 | ) | + | 1 | ÷ | 5 | × | x |
| 方程左边 = | 1 | x | − | 1 | ÷ | 5 | × | x |
| = | 1 | x | − | 1 5 | x |
| = | 4 5 | x |
4 5 | x | = | ( | x | − | 8 | ) | + | 1 | ÷ | 5 | × | x |
| 方程右边 = | ( | x | − | 8 | ) | + | 1 5 | x |
4 5 | x | = | ( | x | − | 8 | ) | + | 1 5 | x |
| 方程右边 = | x | − | 8 | + | 1 5 | x |
| = | 6 5 | x | − | 8 |
4 5 | x | = | 6 5 | x | − | 8 |
4 5 | x | − | 6 5 | x | = | - | 8 |
| - | 2 5 | x | = | - | 8 |
| 8 | = | 2 5 | x |
2 5 | x | = | 8 |
| x | = | 8 | ÷ | 2 5 |
| = | 8 | × | 5 2 |
| = | 4 | × | 5 |
| x | = | 20 |