| 9 | ( | 6 | ( | 3 | ( | x | + | 2 | ) | + | 3 | ) | − | 7 | ) | = | 15 | ( | 2 | x | − | 12 | ) | − | 57 |
| 方程左边 = | 9 | × | 6 | ( | 3 | ( | x | + | 2 | ) | + | 3 | ) | − | 9 | × | 7 |
| = | 54 | ( | 3 | ( | x | + | 2 | ) | + | 3 | ) | − | 63 |
| = | 54 | × | 3 | ( | x | + | 2 | ) | + | 54 | × | 3 | − | 63 |
| = | 162 | ( | x | + | 2 | ) | + | 162 | − | 63 |
| = | 162 | ( | x | + | 2 | ) | + | 99 |
| = | 162 | x | + | 162 | × | 2 | + | 99 |
| = | 162 | x | + | 324 | + | 99 |
| = | 162 | x | + | 423 |
| 162 | x | + | 423 | = | 15 | ( | 2 | x | − | 12 | ) | − | 57 |
| 方程右边 = | 15 | × | 2 | x | − | 15 | × | 12 | − | 57 |
| = | 30 | x | − | 180 | − | 57 |
| = | 30 | x | − | 237 |
| 162 | x | + | 423 | = | 30 | x | − | 237 |
| 162 | x | − | 30 | x | = | - | 237 | − | 423 |
| 132 | x | = | - | 237 | − | 423 |
| 132 | x | = | - | 660 |
| x | = | - | 660 | ÷ | 132 |
| = | - | 660 | × | 1 132 |
| = | - | 5 | × | 1 |
| x | = | - | 5 |