| x | × | 6 5 | × | 9 10 | + | ( | 3600 | − | x | ) | × | 23 20 | × | 9 10 | − | 3600 | = | 198 |
| 方程左边 = | x | × | 27 25 | + | ( | 3600 | − | x | ) | × | 207 200 | − | 3600 |
27 25 | x | + | ( | 3600 | − | x | ) | × | 207 200 | − | 3600 | = | 198 |
| 方程左边 = | 27 25 | x | + | 3600 | × | 207 200 | − | x | × | 207 200 | − | 3600 |
| = | 27 25 | x | + | 3726 | − | x | × | 207 200 | − | 3600 |
| = | 9 200 | x | + | 126 |
9 200 | x | + | 126 | = | 198 |
9 200 | x | = | 198 | − | 126 |
9 200 | x | = | 72 |
| x | = | 72 | ÷ | 9 200 |
| = | 72 | × | 200 9 |
| = | 8 | × | 200 |
| x | = | 1600 |