| - | 13 | + | 2 | ( | 2 | + | 7 | ( | - | 8 | + | 4 | x | ) | ) | = | 5 | ( | 8 | x | + | 11 | ) |
| 方程左边 = | - | 13 | + | 2 | × | 2 | + | 2 | × | 7 | ( | - | 8 | + | 4 | x | ) |
| = | - | 13 | + | 4 | + | 14 | ( | - | 8 | + | 4 | x | ) |
| = | - | 9 | + | 14 | ( | - | 8 | + | 4 | x | ) |
| = | - | 9 | − | 14 | × | 8 | + | 14 | × | 4 | x |
| = | - | 9 | − | 112 | + | 56 | x |
| = | - | 121 | + | 56 | x |
| - | 121 | + | 56 | x | = | 5 | ( | 8 | x | + | 11 | ) |
| 方程右边 = | 5 | × | 8 | x | + | 5 | × | 11 |
| = | 40 | x | + | 55 |
| - | 121 | + | 56 | x | = | 40 | x | + | 55 |
| 56 | x | − | 40 | x | = | 55 | + | 121 |
| 16 | x | = | 55 | + | 121 |
| 16 | x | = | 176 |
| x | = | 176 | ÷ | 16 |
| = | 176 | × | 1 16 |
| = | 11 | × | 1 |
| x | = | 11 |