| 9 | + | 2 | ( | 6 | + | 3 | ( | 3 | + | 3 | x | ) | ) | = | 3 | ( | 10 | x | − | 19 | ) |
| 方程左边 = | 9 | + | 2 | × | 6 | + | 2 | × | 3 | ( | 3 | + | 3 | x | ) |
| = | 9 | + | 12 | + | 6 | ( | 3 | + | 3 | x | ) |
| = | 21 | + | 6 | ( | 3 | + | 3 | x | ) |
| = | 21 | + | 6 | × | 3 | + | 6 | × | 3 | x |
| = | 21 | + | 18 | + | 18 | x |
| = | 39 | + | 18 | x |
| 39 | + | 18 | x | = | 3 | ( | 10 | x | − | 19 | ) |
| 方程右边 = | 3 | × | 10 | x | − | 3 | × | 19 |
| = | 30 | x | − | 57 |
| 39 | + | 18 | x | = | 30 | x | − | 57 |
| 18 | x | − | 30 | x | = | - | 57 | − | 39 |
| - | 12 | x | = | - | 57 | − | 39 |
| - | 12 | x | = | - | 96 |
| 96 | = | 12 | x |
| 12 | x | = | 96 |
| x | = | 96 | ÷ | 12 |
| = | 96 | × | 1 12 |
| = | 8 | × | 1 |
| x | = | 8 |