| ( | 162 | − | 2 | x | ) | ( | 64 | − | 64 | x | ÷ | 81 | ) | = | 7776 |
| 方程左边 = | 162 | ( | 64 | − | 64 | x | ÷ | 81 | ) | − | 2 | x | ( | 64 | − | 64 | x | ÷ | 81 | ) |
| = | 162 | × | 64 | − | 162 | × | 64 | x | ÷ | 81 | − | 2 | x | ( | 64 | − | 64 | x | ÷ | 81 | ) |
| = | 10368 | − | 128 | x | − | 2 | x | ( | 64 | − | 64 | x | ÷ | 81 | ) |
| = | 10368 | − | 128 | x | − | 2 | x | × | 64 | + | 2 | x | × | 64 | x | ÷ | 81 |
| = | 10368 | − | 128 | x | − | 128 | x | + | 128 81 | x | x |
| = | 10368 | − | 256 | x | + | 128 81 | x | x |
| 10368 | − | 256 | x | + | 128 81 | x | x | = | 7776 |