| 3 | ( | ( | ( | x | + | 14 | ) | − | 2 | ) | + | 12 | ) | + | 9 | = | 9 | x | + | 165 |
| 方程左边 = | 3 | ( | ( | x | + | 14 | ) | − | 2 | ) | + | 3 | × | 12 | + | 9 |
| = | 3 | ( | ( | x | + | 14 | ) | − | 2 | ) | + | 36 | + | 9 |
| = | 3 | ( | ( | x | + | 14 | ) | − | 2 | ) | + | 45 |
| = | 3 | ( | x | + | 14 | ) | − | 3 | × | 2 | + | 45 |
| = | 3 | ( | x | + | 14 | ) | − | 6 | + | 45 |
| = | 3 | ( | x | + | 14 | ) | + | 39 |
| = | 3 | x | + | 3 | × | 14 | + | 39 |
| = | 3 | x | + | 42 | + | 39 |
| = | 3 | x | + | 81 |
| 3 | x | + | 81 | = | 9 | x | + | 165 |
| 3 | x | − | 9 | x | = | 165 | − | 81 |
| - | 6 | x | = | 165 | − | 81 |
| - | 6 | x | = | 84 |
| - | 84 | = | 6 | x |
| 6 | x | = | - | 84 |
| x | = | - | 84 | ÷ | 6 |
| = | - | 84 | × | 1 6 |
| = | - | 14 | × | 1 |
| x | = | - | 14 |