| 1419 | − | 12 | ( | 4 | x | − | 17 | ) | = | 3 | ( | 6 | x | + | 211 | ) |
| 方程左边 = | 1419 | − | 12 | × | 4 | x | + | 12 | × | 17 |
| = | 1419 | − | 48 | x | + | 204 |
| = | 1623 | − | 48 | x |
| 1623 | − | 48 | x | = | 3 | ( | 6 | x | + | 211 | ) |
| 方程右边 = | 3 | × | 6 | x | + | 3 | × | 211 |
| = | 18 | x | + | 633 |
| 1623 | − | 48 | x | = | 18 | x | + | 633 |
| - | 48 | x | − | 18 | x | = | 633 | − | 1623 |
| - | 66 | x | = | 633 | − | 1623 |
| - | 66 | x | = | - | 990 |
| 990 | = | 66 | x |
| 66 | x | = | 990 |
| x | = | 990 | ÷ | 66 |
| = | 990 | × | 1 66 |
| = | 15 | × | 1 |
| x | = | 15 |