| 2 | ( | 7 | + | 9 | ( | 14 | − | 2 | x | ) | ) | + | 18 | = | - | 4 |
| 方程左边 = | 2 | × | 7 | + | 2 | × | 9 | ( | 14 | − | 2 | x | ) | + | 18 |
| = | 14 | + | 18 | ( | 14 | − | 2 | x | ) | + | 18 |
| = | 32 | + | 18 | ( | 14 | − | 2 | x | ) |
| = | 32 | + | 18 | × | 14 | − | 18 | × | 2 | x |
| = | 32 | + | 252 | − | 36 | x |
| = | 284 | − | 36 | x |
| 284 | − | 36 | x | = | - | 4 |
| - | 36 | x | = | - | 4 | − | 284 |
| - | 36 | x | = | - | 288 |
| 288 | = | 36 | x |
| 36 | x | = | 288 |
| x | = | 288 | ÷ | 36 |
| = | 288 | × | 1 36 |
| = | 8 | × | 1 |
| x | = | 8 |