| 6 | − | 2 | m | = | 2 | m | ( | ( | - | m | − | 1 | ) | ÷ | m | ) | − | 4 | ( | ( | - | m | − | 1 | ) | ÷ | m | ) | + | 3 |
| 6 | − | 2 | m | = | 2 | × | 1 | ( | - | m | − | 1 | ) | ÷ | 1 | − | 4 | ( | ( | - | m | − | 1 | ) | ÷ | m | ) | + | 3 |
| 6 | − | 2 | m | = | 2 | ( | - | m | − | 1 | ) | − | 4 | ( | ( | - | m | − | 1 | ) | ÷ | m | ) | + | 3 |
| 6 | − | 2 | m | = | - | 2 | m | − | 2 | × | 1 | − | 4 | ( | ( | - | m | − | 1 | ) | ÷ | m | ) | + | 3 |
| 6 | − | 2 | m | = | - | 2 | m | − | 2 | − | 4 | ( | ( | - | m | − | 1 | ) | ÷ | m | ) | + | 3 |
| 6 | − | 2 | m | = | - | 2 | m | + | 1 | − | 4 | ( | ( | - | m | − | 1 | ) | ÷ | m | ) |
| 6 | − | 2 | m | = | - | 2 | m | + | 1 | − | 4 | ( | - | m | − | 1 | ) | ÷ | m |
| 方程两边同时乘以: | m |
| 6 | m | − | 2 | m | m | = | - | 2 | m | m | + | 1 | m | − | 4 | ( | - | m | − | 1 | ) |
| 6 | m | − | 2 | m | m | = | - | 2 | m | m | + | 1 | m | + | 4 | m | + | 4 | × | 1 |
| 6 | m | − | 2 | m | m | = | - | 2 | m | m | + | 1 | m | + | 4 | m | + | 4 |
| 6 | m | − | 2 | m | m | = | - | 2 | m | m | + | 5 | m | + | 4 |