| 336 | − | 1 10 | m | × | 28 | = | ( | 1323 | − | 3 10 | m | × | 63 | ) | ÷ | 3 |
| 方程左边 = | 336 | − | 14 5 | m |
| 336 | − | 14 5 | m | = | ( | 1323 | − | 3 10 | m | × | 63 | ) | ÷ | 3 |
| 方程右边 = | 1323 | × | 1 3 | − | 3 10 | m | × | 63 | × | 1 3 |
| = | 441 | − | 63 10 | m |
| 336 | − | 14 5 | m | = | 441 | − | 63 10 | m |
| - | 14 5 | m | + | 63 10 | m | = | 441 | − | 336 |
7 2 | m | = | 441 | − | 336 |
7 2 | m | = | 105 |
| m | = | 105 | ÷ | 7 2 |
| = | 105 | × | 2 7 |
| = | 15 | × | 2 |
| m | = | 30 |