| ( | 1 | − | 1 | ÷ | 5 | × | x | ) | = | ( | 1 | − | 1 | ÷ | 4 | × | x | ) | × | 4 |
| 方程左边 = | 1 | − | 1 | ÷ | 5 | × | x |
| = | 1 | − | 1 5 | x |
| 1 | − | 1 5 | x | = | ( | 1 | − | 1 | ÷ | 4 | × | x | ) | × | 4 |
| 方程右边 = | 1 | × | 4 | − | 1 | ÷ | 4 | × | x | × | 4 |
| = | 4 | − | 1 | x |
| 1 | − | 1 5 | x | = | 4 | − | 1 | x |
| - | 1 5 | x | + | 1 | x | = | 4 | − | 1 |
4 5 | x | = | 4 | − | 1 |
4 5 | x | = | 3 |
| x | = | 3 | ÷ | 4 5 |
| = | 3 | × | 5 4 |
| x | = | 15 4 |
| x | = | 3.75 |