| 2500000 | + | X | × | 2500 | × | 64 100 | + | X | × | 2500 | × | 16 100 | = | X | × | 2500 |
| 方程左边 = | 2500000 | + | X | × | 1600 | + | X | × | 400 |
| = | 2500000 | + | 2000 | X |
| 2500000 | + | 2000 | X | = | X | × | 2500 |
| 2000 | X | − | 2500 | X | = | - | 2500000 |
| - | 500 | X | = | - | 2500000 |
| 2500000 | = | 500 | X |
| 500 | X | = | 2500000 |
| X | = | 2500000 | ÷ | 500 |
| = | 2500000 | × | 1 500 |
| = | 5000 | × | 1 |
| X | = | 5000 |