| - | 6 | + | 3 | ( | 1 | + | 8 | ( | 17 | + | 4 | x | ) | ) | = | 19 | ( | 3 | x | + | 9 | ) |
| 方程左边 = | - | 6 | + | 3 | × | 1 | + | 3 | × | 8 | ( | 17 | + | 4 | x | ) |
| = | - | 6 | + | 3 | + | 24 | ( | 17 | + | 4 | x | ) |
| = | - | 3 | + | 24 | ( | 17 | + | 4 | x | ) |
| = | - | 3 | + | 24 | × | 17 | + | 24 | × | 4 | x |
| = | - | 3 | + | 408 | + | 96 | x |
| = | 405 | + | 96 | x |
| 405 | + | 96 | x | = | 19 | ( | 3 | x | + | 9 | ) |
| 方程右边 = | 19 | × | 3 | x | + | 19 | × | 9 |
| = | 57 | x | + | 171 |
| 405 | + | 96 | x | = | 57 | x | + | 171 |
| 96 | x | − | 57 | x | = | 171 | − | 405 |
| 39 | x | = | 171 | − | 405 |
| 39 | x | = | - | 234 |
| x | = | - | 234 | ÷ | 39 |
| = | - | 234 | × | 1 39 |
| = | - | 6 | × | 1 |
| x | = | - | 6 |