| 6 | + | 6 | ( | 3 | + | 7 | ( | 13 | − | 4 | x | ) | ) | = | 2 | ( | - | 14 | x | + | 5 | ) |
| 方程左边 = | 6 | + | 6 | × | 3 | + | 6 | × | 7 | ( | 13 | − | 4 | x | ) |
| = | 6 | + | 18 | + | 42 | ( | 13 | − | 4 | x | ) |
| = | 24 | + | 42 | ( | 13 | − | 4 | x | ) |
| = | 24 | + | 42 | × | 13 | − | 42 | × | 4 | x |
| = | 24 | + | 546 | − | 168 | x |
| = | 570 | − | 168 | x |
| 570 | − | 168 | x | = | 2 | ( | - | 14 | x | + | 5 | ) |
| 方程右边 = | - | 2 | × | 14 | x | + | 2 | × | 5 |
| = | - | 28 | x | + | 10 |
| 570 | − | 168 | x | = | - | 28 | x | + | 10 |
| - | 168 | x | + | 28 | x | = | 10 | − | 570 |
| - | 140 | x | = | 10 | − | 570 |
| - | 140 | x | = | - | 560 |
| 560 | = | 140 | x |
| 140 | x | = | 560 |
| x | = | 560 | ÷ | 140 |
| = | 560 | × | 1 140 |
| = | 4 | × | 1 |
| x | = | 4 |