| 5 | x | + | 2 | x | × | 8 | + | ( | 11 | − | 2 | x | ) | × | 11 | = | 116 |
| 方程左边 = | 5 | x | + | 16 | x | + | ( | 11 | − | 2 | x | ) | × | 11 |
| = | 21 | x | + | ( | 11 | − | 2 | x | ) | × | 11 |
| 21 | x | + | ( | 11 | − | 2 | x | ) | × | 11 | = | 116 |
| 方程左边 = | 21 | x | + | 11 | × | 11 | − | 2 | x | × | 11 |
| = | 21 | x | + | 121 | − | 22 | x |
| = | - | 1 | x | + | 121 |
| - | 1 | x | + | 121 | = | 116 |
| - | 1 | x | = | 116 | − | 121 |
| - | x | = | 116 | − | 121 |
| - | x | = | - | 5 |
| 5 | = | x |
| x | = | 5 |