| 2 | ( | 3 | ( | 3 | x | + | 17 | ) | + | 5 | ) | + | 15 | = | 6 | x | + | 151 |
| 方程左边 = | 2 | × | 3 | ( | 3 | x | + | 17 | ) | + | 2 | × | 5 | + | 15 |
| = | 6 | ( | 3 | x | + | 17 | ) | + | 10 | + | 15 |
| = | 6 | ( | 3 | x | + | 17 | ) | + | 25 |
| = | 6 | × | 3 | x | + | 6 | × | 17 | + | 25 |
| = | 18 | x | + | 102 | + | 25 |
| = | 18 | x | + | 127 |
| 18 | x | + | 127 | = | 6 | x | + | 151 |
| 18 | x | − | 6 | x | = | 151 | − | 127 |
| 12 | x | = | 151 | − | 127 |
| 12 | x | = | 24 |
| x | = | 24 | ÷ | 12 |
| = | 24 | × | 1 12 |
| = | 2 | × | 1 |
| x | = | 2 |