| m | ÷ | 2500 | + | ( | 509 50 | − | m | ) | ÷ | 1000 | = | 1 100 |
| 方程左边 = | 1 2500 | m | + | 509 50 | × | 1 1000 | − | m | × | 1 1000 |
| = | 1 2500 | m | + | 509 50000 | − | m | × | 1 1000 |
| = | - | 3 5000 | m | + | 509 50000 |
| - | 3 5000 | m | + | 509 50000 | = | 1 100 |
| - | 3 5000 | m | = | 1 100 | − | 509 50000 |
| - | 3 5000 | m | = | - | 9 50000 |
9 50000 | = | 3 5000 | m |
3 5000 | m | = | 9 50000 |
| m | = | 9 50000 | ÷ | 3 5000 |
| = | 9 50000 | × | 5000 3 |
| = | 3 10 | × | 1 |
| m | = | 3 10 |
| m | = | 0.3 |