| 1 | ÷ | 3 | − | 2 | ÷ | 3 | × | b | + | 3 | ÷ | 4 | = | - | 5 | ÷ | 6 | × | b |
| 方程左边 = | 1 3 | − | 2 3 | b | + | 3 4 |
| = | 13 12 | − | 2 3 | b |
13 12 | − | 2 3 | b | = | - | 5 | ÷ | 6 | × | b |
| 方程右边 = | - | 5 6 | b |
13 12 | − | 2 3 | b | = | - | 5 6 | b |
| - | 2 3 | b | + | 5 6 | b | = | - | 13 12 |
1 6 | b | = | - | 13 12 |
| b | = | - | 13 12 | ÷ | 1 6 |
| = | - | 13 12 | × | 6 |
| = | - | 13 2 | × | 1 |
| b | = | - | 13 2 |
| b | = | - 6.5 |