| ( | a | − | 1 | ÷ | 2 | ) | × | 2 | + | ( | a | ÷ | 2 | + | 3 | ÷ | 2 | + | 7 | ÷ | 8 | ) | = | 449 | ÷ | 64 |
| 方程左边 = | a | × | 2 | − | 1 | ÷ | 2 | × | 2 | + | ( | a | ÷ | 2 | + | 3 | ÷ | 2 | + | 7 | ÷ | 8 | ) |
| = | a | × | 2 | − | 1 | + | ( | a | ÷ | 2 | + | 3 | ÷ | 2 | + | 7 | ÷ | 8 | ) |
| = | 2 | a | − | 1 | + | a | ÷ | 2 | + | 3 | ÷ | 2 | + | 7 | ÷ | 8 |
| = | 2 | a | − | 1 | + | a | × | 1 2 | + | 3 2 | + | 7 8 |
| = | 5 2 | a | + | 11 8 |
5 2 | a | + | 11 8 | = | 449 | ÷ | 64 |
| 方程右边 = | 449 64 |
5 2 | a | + | 11 8 | = | 449 64 |
5 2 | a | = | 449 64 | − | 11 8 |
5 2 | a | = | 361 64 |
| a | = | 361 64 | ÷ | 5 2 |
| = | 361 64 | × | 2 5 |
| = | 361 32 | × | 1 5 |
| a | = | 361 160 |
| a | = | 2.25625 |