| x | − | 2 | ÷ | 5 | × | x | − | ( | 1 | ÷ | 3 | × | x | − | 12 | ) | = | 24 |
| 方程左边 = | x | − | 2 5 | x | − | ( | 1 | ÷ | 3 | × | x | − | 12 | ) |
| = | 3 5 | x | − | ( | 1 | ÷ | 3 | × | x | − | 12 | ) |
3 5 | x | − | ( | 1 | ÷ | 3 | × | x | − | 12 | ) | = | 24 |
| 方程左边 = | 3 5 | x | − | 1 | ÷ | 3 | × | x | + | 12 |
| = | 3 5 | x | − | 1 3 | x | + | 12 |
| = | 4 15 | x | + | 12 |
4 15 | x | + | 12 | = | 24 |
4 15 | x | = | 24 | − | 12 |
4 15 | x | = | 12 |
| x | = | 12 | ÷ | 4 15 |
| = | 12 | × | 15 4 |
| = | 3 | × | 15 |
| x | = | 45 |