| ( | x | − | 8 | ) | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) | = | 640 |
| 方程左边 = | x | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) | − | 8 | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) |
| = | x | × | 200 | − | x | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | − | 8 | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) |
| = | x | × | 200 | − | x | ( | x | − | 8 | ) | × | 20 | − | 8 | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) |
| = | 200 | x | − | x | x | × | 20 | + | x | × | 8 | × | 20 | − | 8 | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) |
| = | 200 | x | − | x | x | × | 20 | + | x | × | 160 | − | 8 | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) |
| = | 360 | x | − | x | x | × | 20 | − | 8 | ( | 200 | − | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 | ) |
| = | 360 | x | − | x | x | × | 20 | − | 8 | × | 200 | + | 8 | ( | x | − | 8 | ) | ÷ | 1 2 | × | 10 |
| = | 360 | x | − | x | x | × | 20 | − | 1600 | + | 160 | ( | x | − | 8 | ) |
| = | 360 | x | − | x | x | × | 20 | − | 1600 | + | 160 | x | − | 160 | × | 8 |
| = | 360 | x | − | x | x | × | 20 | − | 1600 | + | 160 | x | − | 1280 |
| = | 520 | x | − | x | x | × | 20 | − | 2880 |
| 520 | x | − | x | x | × | 20 | − | 2880 | = | 640 |