| a | + | 5 | = | 2 | ÷ | 3 | × | ( | - | a | − | 4 | a | + | 5 | − | a | − | 5 | ) |
| 方程右边 = | 2 3 | ( | - | a | − | 4 | a | + | 5 | − | a | − | 5 | ) |
| a | + | 5 | = | 2 3 | ( | - | a | − | 4 | a | + | 5 | − | a | − | 5 | ) |
| 方程右边 = | - | 2 3 | a | − | 2 3 | × | 4 | a | + | 2 3 | × | 5 | − | 2 3 | a | − | 2 3 | × | 5 |
| = | - | 2 3 | a | − | 8 3 | a | + | 10 3 | − | 2 3 | a | − | 10 3 |
| = | - | 4 | a | + | 0 |
| a | + | 5 | = | - | 4 | a | + | 0 |
| a | + | 4 | a | = | - | 5 |
| 5 | a | = | - | 5 |
| a | = | - | 5 | ÷ | 5 |
| = | - | 5 | × | 1 5 |
| = | - | 1 | × | 1 |
| a | = | - | 1 |