| 6030 | = | X | + | ( | X | − | 5000 | ) | × | 3 100 |
| 方程右边 = | X | + | X | × | 3 100 | − | 5000 | × | 3 100 |
| = | X | + | X | × | 3 100 | − | 150 |
| = | 103 100 | X | − | 150 |
| 6030 | = | 103 100 | X | − | 150 |
| - | 103 100 | X | = | - | 150 | − | 6030 |
| - | 103 100 | X | = | - | 6180 |
| 6180 | = | 103 100 | X |
103 100 | X | = | 6180 |
| X | = | 6180 | ÷ | 103 100 |
| = | 6180 | × | 100 103 |
| X | = | 618000 103 |
| X | = | 6000 |