| 1600 | ( | 1 | + | 7 20 | ) | − | 1600 | = | 2 | ( | 1 | + | 7 20 | ) | x |
| 方程左边 = | 1600 | × | 1 | + | 1600 | × | 7 20 | − | 1600 |
| = | 1600 | + | 560 | − | 1600 |
| = | 560 |
| 560 | = | 2 | ( | 1 | + | 7 20 | ) | x |
| 方程右边 = | 2 | × | 1 | x | + | 2 | × | 7 20 | x |
| = | 2 | x | + | 7 10 | x |
| = | 27 10 | x |
| 560 | = | 27 10 | x |
| - | 27 10 | x | = | - | 560 |
| 560 | = | 27 10 | x |
27 10 | x | = | 560 |
| x | = | 560 | ÷ | 27 10 |
| = | 560 | × | 10 27 |
| x | = | 5600 27 |
| x | = | 207.407407 |