| 2000 | ÷ | 25 | × | x | = | 3200 | ÷ | 50 | × | ( | 36 | − | x | ) |
| 方程左边 = | 80 | x |
| 80 | x | = | 3200 | ÷ | 50 | × | ( | 36 | − | x | ) |
| 方程右边 = | 64 | ( | 36 | − | x | ) |
| 80 | x | = | 64 | ( | 36 | − | x | ) |
| 方程右边 = | 64 | × | 36 | − | 64 | x |
| = | 2304 | − | 64 | x |
| 80 | x | = | 2304 | − | 64 | x |
| 80 | x | + | 64 | x | = | 2304 |
| 144 | x | = | 2304 |
| x | = | 2304 | ÷ | 144 |
| = | 2304 | × | 1 144 |
| = | 16 | × | 1 |
| x | = | 16 |