| 3 | ÷ | 8 | × | z | − | 4 | = | 1 | ÷ | 2 | + | 3 | ÷ | 4 | × | z |
| 方程左边 = | 3 8 | z | − | 4 |
3 8 | z | − | 4 | = | 1 | ÷ | 2 | + | 3 | ÷ | 4 | × | z |
| 方程右边 = | 1 2 | + | 3 4 | z |
3 8 | z | − | 4 | = | 1 2 | + | 3 4 | z |
3 8 | z | − | 3 4 | z | = | 1 2 | + | 4 |
| - | 3 8 | z | = | 1 2 | + | 4 |
| - | 3 8 | z | = | 9 2 |
| - | 9 2 | = | 3 8 | z |
3 8 | z | = | - | 9 2 |
| z | = | - | 9 2 | ÷ | 3 8 |
| = | - | 9 2 | × | 8 3 |
| = | - | 3 | × | 4 |
| z | = | - | 12 |