| 10 | − | 3 | ( | m | − | 2 | ) | = | 7 | ( | 2 | − | m | ) |
| 方程左边 = | 10 | − | 3 | m | + | 3 | × | 2 |
| = | 10 | − | 3 | m | + | 6 |
| = | 16 | − | 3 | m |
| 16 | − | 3 | m | = | 7 | ( | 2 | − | m | ) |
| 方程右边 = | 7 | × | 2 | − | 7 | m |
| = | 14 | − | 7 | m |
| 16 | − | 3 | m | = | 14 | − | 7 | m |
| - | 3 | m | + | 7 | m | = | 14 | − | 16 |
| 4 | m | = | 14 | − | 16 |
| 4 | m | = | - | 2 |
| m | = | - | 2 | ÷ | 4 |
| = | - | 2 | × | 1 4 |
| = | - | 1 | × | 1 2 |
| m | = | - | 1 2 |
| m | = | - 0.5 |