| 1000000 | = | 500 | Q | − | ( | 6000000 | + | 250 | Q | ) |
| 方程右边 = | 500 | Q | − | 6000000 | − | 250 | Q |
| = | 250 | Q | − | 6000000 |
| 1000000 | = | 250 | Q | − | 6000000 |
| - | 250 | Q | = | - | 6000000 | − | 1000000 |
| - | 250 | Q | = | - | 7000000 |
| 7000000 | = | 250 | Q |
| 250 | Q | = | 7000000 |
| Q | = | 7000000 | ÷ | 250 |
| = | 7000000 | × | 1 250 |
| = | 28000 | × | 1 |
| Q | = | 28000 |