| - | 2 | + | 2 | ( | - | 18 | + | 17 | ( | 8 | + | 3 | x | ) | ) | = | 4 | ( | 7 | x | + | 3 | ) |
| 方程左边 = | - | 2 | − | 2 | × | 18 | + | 2 | × | 17 | ( | 8 | + | 3 | x | ) |
| = | - | 2 | − | 36 | + | 34 | ( | 8 | + | 3 | x | ) |
| = | - | 38 | + | 34 | ( | 8 | + | 3 | x | ) |
| = | - | 38 | + | 34 | × | 8 | + | 34 | × | 3 | x |
| = | - | 38 | + | 272 | + | 102 | x |
| = | 234 | + | 102 | x |
| 234 | + | 102 | x | = | 4 | ( | 7 | x | + | 3 | ) |
| 方程右边 = | 4 | × | 7 | x | + | 4 | × | 3 |
| = | 28 | x | + | 12 |
| 234 | + | 102 | x | = | 28 | x | + | 12 |
| 102 | x | − | 28 | x | = | 12 | − | 234 |
| 74 | x | = | 12 | − | 234 |
| 74 | x | = | - | 222 |
| x | = | - | 222 | ÷ | 74 |
| = | - | 222 | × | 1 74 |
| = | - | 3 | × | 1 |
| x | = | - | 3 |