| 2 | ( | 2 | ( | - | 2 | ( | 2 | x | + | 10 | ) | + | 7 | ) | + | 3 | ) | − | 8 | = | 138 |
| 方程左边 = | 2 | × | 2 | ( | - | 2 | ( | 2 | x | + | 10 | ) | + | 7 | ) | + | 2 | × | 3 | − | 8 |
| = | 4 | ( | - | 2 | ( | 2 | x | + | 10 | ) | + | 7 | ) | + | 6 | − | 8 |
| = | 4 | ( | - | 2 | ( | 2 | x | + | 10 | ) | + | 7 | ) | − | 2 |
| = | - | 4 | × | 2 | ( | 2 | x | + | 10 | ) | + | 4 | × | 7 | − | 2 |
| = | - | 8 | ( | 2 | x | + | 10 | ) | + | 28 | − | 2 |
| = | - | 8 | ( | 2 | x | + | 10 | ) | + | 26 |
| = | - | 8 | × | 2 | x | − | 8 | × | 10 | + | 26 |
| = | - | 16 | x | − | 80 | + | 26 |
| = | - | 16 | x | − | 54 |
| - | 16 | x | − | 54 | = | 138 |
| - | 16 | x | = | 138 | + | 54 |
| - | 16 | x | = | 192 |
| - | 192 | = | 16 | x |
| 16 | x | = | - | 192 |
| x | = | - | 192 | ÷ | 16 |
| = | - | 192 | × | 1 16 |
| = | - | 12 | × | 1 |
| x | = | - | 12 |