| x | − | ( | 1 | ÷ | 9 | + | 8 | ) | x | − | ( | 1 | ÷ | 8 | − | 5 | ) | x | = | 272 |
| 方程左边 = | x | − | 1 | ÷ | 9 | × | x | − | 8 | x | − | ( | 1 | ÷ | 8 | − | 5 | ) | x |
| = | x | − | 1 9 | x | − | 8 | x | − | ( | 1 | ÷ | 8 | − | 5 | ) | x |
| = | - | 64 9 | x | − | ( | 1 | ÷ | 8 | − | 5 | ) | x |
| = | - | 64 9 | x | − | 1 | ÷ | 8 | × | x | + | 5 | x |
| = | - | 64 9 | x | − | 1 8 | x | + | 5 | x |
| = | - | 161 72 | x |
| - | 161 72 | x | = | 272 |
| - | 272 | = | 161 72 | x |
161 72 | x | = | - | 272 |
| x | = | - | 272 | ÷ | 161 72 |
| = | - | 272 | × | 72 161 |
| x | = | - | 19584 161 |
| x | = | - 121.639752 |