| 2 | ( | 2 | ( | 3 | ( | x | + | 7 | ) | + | 1 | ) | − | 3 | ) | + | 8 | = | - | 54 |
| 方程左边 = | 2 | × | 2 | ( | 3 | ( | x | + | 7 | ) | + | 1 | ) | − | 2 | × | 3 | + | 8 |
| = | 4 | ( | 3 | ( | x | + | 7 | ) | + | 1 | ) | − | 6 | + | 8 |
| = | 4 | ( | 3 | ( | x | + | 7 | ) | + | 1 | ) | + | 2 |
| = | 4 | × | 3 | ( | x | + | 7 | ) | + | 4 | × | 1 | + | 2 |
| = | 12 | ( | x | + | 7 | ) | + | 4 | + | 2 |
| = | 12 | ( | x | + | 7 | ) | + | 6 |
| = | 12 | x | + | 12 | × | 7 | + | 6 |
| = | 12 | x | + | 84 | + | 6 |
| = | 12 | x | + | 90 |
| 12 | x | + | 90 | = | - | 54 |
| 12 | x | = | - | 54 | − | 90 |
| 12 | x | = | - | 144 |
| x | = | - | 144 | ÷ | 12 |
| = | - | 144 | × | 1 12 |
| = | - | 12 | × | 1 |
| x | = | - | 12 |