| 1400 | Q | − | ( | ( | 400 | + | 550 | Q | ) | ) | − | 1400 | Q | × | 3 50 | = | 0 |
| 方程左边 = | 1400 | Q | − | ( | ( | 400 | + | 550 | Q | ) | ) | − | 84 | Q |
| = | 1316 | Q | − | ( | ( | 400 | + | 550 | Q | ) | ) |
| 1316 | Q | − | ( | ( | 400 | + | 550 | Q | ) | ) | = | 0 |
| 方程左边 = | 1316 | Q | − | ( | 400 | + | 550 | Q | ) |
| = | 1316 | Q | − | 400 | − | 550 | Q |
| = | 766 | Q | − | 400 |
| 766 | Q | − | 400 | = | 0 |
| 766 | Q | = | 0 | + | 400 |
| 766 | Q | = | 400 |
| Q | = | 400 | ÷ | 766 |
| = | 400 | × | 1 766 |
| = | 200 | × | 1 383 |
| Q | = | 200 383 |
| Q | = | 0.522193 |