| x | − | 1 | ÷ | 2 | × | x | − | 6 | − | ( | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 | ÷ | 2 | + | 3 | ) | = | 15 |
| 方程左边 = | x | − | 1 2 | x | − | 6 | − | ( | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 | ÷ | 2 | + | 3 | ) |
| = | 1 2 | x | − | 6 | − | ( | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 | ÷ | 2 | + | 3 | ) |
1 2 | x | − | 6 | − | ( | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 | ÷ | 2 | + | 3 | ) | = | 15 |
| 方程左边 = | 1 2 | x | − | 6 | − | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 | ÷ | 2 | − | 3 |
| = | 1 2 | x | − | 6 | − | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 2 | − | 3 |
| = | 1 2 | x | − | 9 | − | ( | x | − | 1 | ÷ | 2 | × | x | − | 6 | ) | × | 1 2 |
| = | 1 2 | x | − | 9 | − | x | × | 1 2 | + | 1 | ÷ | 2 | × | x | × | 1 2 | + | 6 | × | 1 2 |
| = | 1 2 | x | − | 9 | − | x | × | 1 2 | + | 1 4 | x | + | 3 |
| = | 1 4 | x | − | 6 |
1 4 | x | − | 6 | = | 15 |
1 4 | x | = | 15 | + | 6 |
1 4 | x | = | 21 |
| x | = | 21 | ÷ | 1 4 |
| = | 21 | × | 4 |
| x | = | 84 |