| 18 | + | 2 | ( | 3 | + | 2 | ( | 3 | + | 7 | x | ) | ) | = | 4 | ( | 8 | x | − | 10 | ) |
| 方程左边 = | 18 | + | 2 | × | 3 | + | 2 | × | 2 | ( | 3 | + | 7 | x | ) |
| = | 18 | + | 6 | + | 4 | ( | 3 | + | 7 | x | ) |
| = | 24 | + | 4 | ( | 3 | + | 7 | x | ) |
| = | 24 | + | 4 | × | 3 | + | 4 | × | 7 | x |
| = | 24 | + | 12 | + | 28 | x |
| = | 36 | + | 28 | x |
| 36 | + | 28 | x | = | 4 | ( | 8 | x | − | 10 | ) |
| 方程右边 = | 4 | × | 8 | x | − | 4 | × | 10 |
| = | 32 | x | − | 40 |
| 36 | + | 28 | x | = | 32 | x | − | 40 |
| 28 | x | − | 32 | x | = | - | 40 | − | 36 |
| - | 4 | x | = | - | 40 | − | 36 |
| - | 4 | x | = | - | 76 |
| 76 | = | 4 | x |
| 4 | x | = | 76 |
| x | = | 76 | ÷ | 4 |
| = | 76 | × | 1 4 |
| = | 19 | × | 1 |
| x | = | 19 |