| ( | 3500 | Q | × | 13 100 | − | ( | 5 | + | 150 | Q | ) | − | 140 | ) | × | 3 25 | = | 0 |
| 方程左边 = | 3500 | Q | × | 13 100 | × | 3 25 | − | ( | 5 | + | 150 | Q | ) | × | 3 25 | − | 140 | × | 3 25 |
| = | 273 5 | Q | − | ( | 5 | + | 150 | Q | ) | × | 3 25 | − | 84 5 |
| = | 273 5 | Q | − | 5 | × | 3 25 | − | 150 | Q | × | 3 25 | − | 84 5 |
| = | 273 5 | Q | − | 3 5 | − | 18 | Q | − | 84 5 |
| = | 183 5 | Q | − | 87 5 |
183 5 | Q | − | 87 5 | = | 0 |
183 5 | Q | = | 0 | + | 87 5 |
183 5 | Q | = | 87 5 |
| Q | = | 87 5 | ÷ | 183 5 |
| = | 87 5 | × | 5 183 |
| = | 29 | × | 1 61 |
| Q | = | 29 61 |
| Q | = | 0.47541 |