| ( | 2 | ( | m | − | 1 | ) | ) | ÷ | 12 | − | ( | 4 | − | 3 | m | ) | ÷ | 4 | = | 1 | − | ( | 1 | − | 2 | m | ) | ÷ | 12 |
| 方程左边 = | 2 | ( | m | − | 1 | ) | × | 1 12 | − | ( | 4 | − | 3 | m | ) | × | 1 4 |
| = | 1 6 | ( | m | − | 1 | ) | − | ( | 4 | − | 3 | m | ) | × | 1 4 |
| = | 1 6 | m | − | 1 6 | × | 1 | − | ( | 4 | − | 3 | m | ) | × | 1 4 |
| = | 1 6 | m | − | 1 6 | − | ( | 4 | − | 3 | m | ) | × | 1 4 |
| = | 1 6 | m | − | 1 6 | − | 4 | × | 1 4 | + | 3 | m | × | 1 4 |
| = | 1 6 | m | − | 1 6 | − | 1 | + | 3 4 | m |
| = | 11 12 | m | − | 7 6 |
11 12 | m | − | 7 6 | = | 1 | − | ( | 1 | − | 2 | m | ) | ÷ | 12 |
| 方程右边 = | 1 | − | 1 | × | 1 12 | + | 2 | m | × | 1 12 |
| = | 1 | − | 1 12 | + | 1 6 | m |
| = | 11 12 | + | 1 6 | m |
11 12 | m | − | 7 6 | = | 11 12 | + | 1 6 | m |
11 12 | m | − | 1 6 | m | = | 11 12 | + | 7 6 |
3 4 | m | = | 11 12 | + | 7 6 |
3 4 | m | = | 25 12 |
| m | = | 25 12 | ÷ | 3 4 |
| = | 25 12 | × | 4 3 |
| = | 25 3 | × | 1 3 |
| m | = | 25 9 |
| m | = | 2.777778 |