| x | − | ( | x | ÷ | 2 | − | 600 | ) | = | ( | x | ÷ | 2 | − | 600 | ) | ÷ | 2 | + | 800 | + | 480 |
| 方程左边 = | x | − | x | ÷ | 2 | + | 600 |
| = | 1 2 | x | + | 600 |
1 2 | x | + | 600 | = | ( | x | ÷ | 2 | − | 600 | ) | ÷ | 2 | + | 800 | + | 480 |
| 方程右边 = | ( | x | ÷ | 2 | − | 600 | ) | × | 1 2 | + | 1280 |
1 2 | x | + | 600 | = | ( | x | ÷ | 2 | − | 600 | ) | × | 1 2 | + | 1280 |
| 方程右边 = | x | ÷ | 2 | × | 1 2 | − | 600 | × | 1 2 | + | 1280 |
| = | x | × | 1 4 | − | 300 | + | 1280 |
| = | 1 4 | x | + | 980 |
1 2 | x | + | 600 | = | 1 4 | x | + | 980 |
1 2 | x | − | 1 4 | x | = | 980 | − | 600 |
1 4 | x | = | 980 | − | 600 |
1 4 | x | = | 380 |
| x | = | 380 | ÷ | 1 4 |
| = | 380 | × | 4 |
| x | = | 1520 |