| 19 | ( | - | 3 | ( | 2 | ( | x | + | 1 | ) | + | 9 | ) | + | 19 | ) | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) | = | - | 29 |
| 方程左边 = | - | 19 | × | 3 | ( | 2 | ( | x | + | 1 | ) | + | 9 | ) | + | 19 | × | 19 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 57 | ( | 2 | ( | x | + | 1 | ) | + | 9 | ) | + | 361 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 57 | × | 2 | ( | x | + | 1 | ) | − | 57 | × | 9 | + | 361 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 114 | ( | x | + | 1 | ) | − | 513 | + | 361 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 114 | ( | x | + | 1 | ) | − | 152 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 114 | x | − | 114 | × | 1 | − | 152 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 114 | x | − | 114 | − | 152 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 114 | x | − | 266 | + | 7 | ( | 12 | + | 5 | ( | 9 | + | 3 | x | ) | ) |
| = | - | 114 | x | − | 266 | + | 7 | × | 12 | + | 7 | × | 5 | ( | 9 | + | 3 | x | ) |
| = | - | 114 | x | − | 266 | + | 84 | + | 35 | ( | 9 | + | 3 | x | ) |
| = | - | 114 | x | − | 182 | + | 35 | ( | 9 | + | 3 | x | ) |
| = | - | 114 | x | − | 182 | + | 35 | × | 9 | + | 35 | × | 3 | x |
| = | - | 114 | x | − | 182 | + | 315 | + | 105 | x |
| = | - | 9 | x | + | 133 |
| - | 9 | x | + | 133 | = | - | 29 |
| - | 9 | x | = | - | 29 | − | 133 |
| - | 9 | x | = | - | 162 |
| 162 | = | 9 | x |
| 9 | x | = | 162 |
| x | = | 162 | ÷ | 9 |
| = | 162 | × | 1 9 |
| = | 18 | × | 1 |
| x | = | 18 |