| 5000 | x | × | 50 100 | − | 5000 | x | × | 15 100 | − | 5000 | ( | 1 | + | x | ) | × | 8 100 | × | 20 100 | = | 0 |
| 方程左边 = | 2500 | x | − | 750 | x | − | 80 | ( | 1 | + | x | ) |
| = | 1750 | x | − | 80 | ( | 1 | + | x | ) |
| 1750 | x | − | 80 | ( | 1 | + | x | ) | = | 0 |
| 方程左边 = | 1750 | x | − | 80 | × | 1 | − | 80 | x |
| = | 1750 | x | − | 80 | − | 80 | x |
| = | 1670 | x | − | 80 |
| 1670 | x | − | 80 | = | 0 |
| 1670 | x | = | 0 | + | 80 |
| 1670 | x | = | 80 |
| x | = | 80 | ÷ | 1670 |
| = | 80 | × | 1 1670 |
| = | 8 | × | 1 167 |
| x | = | 8 167 |
| x | = | 0.047904 |